Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5511340b7def1c…

MALICIOUS

PDF

37.8 KB Created: 2020-10-27 16:22:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 48aaea90ad440bd83efbdd56a3890408 SHA-1: 35e5beb0aa1fac3a9ee65f63e8f0963f3fe937e3 SHA-256: 1a5511340b7def1c3427ecb4247998133289c8d05fac3bd151c71dcf56663db7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to various domains, including a known malicious redirector at 'ggtraff.ru'. This indicates the document functions as a link farm, attempting to direct users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=pizza+hut+chicken+alfredo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5f938b0586957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_5f968c8824058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5f88c1e9d1cc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f94012dbfadc.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/bupemigimamuvap.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/bobizetaxoji-dezow.pdfIn PDF document text
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/dedulowibox.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/8c09e1a.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/fudikiwelabafe-gumikumuxu-panerezerexe-mixakoda.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/1ff203b6.pdfIn PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/dudinagofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/figugipopar/68432717751.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/41893146048.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/61386794750.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/1196152203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24002060-4f94-4733-a5ca-d9d73a6c7434/79776057557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f694765a-253a-445e-b1ed-bb16d297388d/rebisakegulosodopokejelev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304a72e8-38b3-457b-997f-f694eb6ab781/rimixuzijara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1f327fc-cb0d-4240-97e9-168492632c02/daxogoxiboduf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5307/0509/files/uniform_circular_motion_and_centripetal_acceleration_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/7527/3372/files/resignation_letter_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8593/7818/files/potuwapilanitiromomo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/vupexiti.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54EA 5044 bytes
SHA-256: a3ef242e7984088441bc9447a38a44c4ad77048ee40f9975d20e0b9653e49627
font_01_sfnt_off0000660c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x660C 10864 bytes
SHA-256: 1a4559d1da3830381471fd9dd72ba9aa87c8caacf234309ccd5f013d0086babb