Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16ac37bd337de03…

MALICIOUS

PDF

41.7 KB Created: 2020-10-20 20:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 380829e038f9859d4f658e4a148f5880 SHA-1: 88bf62a65cae1045e8fa4c45912d0cdd7d3f6eb2 SHA-256: b16ac37bd337de03d27eb2d0396c0a936927df3d70e8cb7a002626ac24b78ff6
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with a critical heuristic identifying a redirector link to 'https://ttraff.me/123?keyword=kandungan+kimia+tapak+liman+pdf'. This, combined with the PDF_SEO_LINK_FARM heuristic indicating a link farm, suggests a phishing or malware distribution attempt disguised as a free download. No scripts were extracted, but the presence of embedded URLs points to an attempt to redirect the user to malicious infrastructure.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ttraff.me/123?keyword=kandungan+kimia+tapak+liman+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f8bc59ca3855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f87a883237ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5f8e5e3b00c1c.pdfIn PDF document text
    • https://pujatimosu.weebly.com/uploads/1/3/2/6/132681823/1392043.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/cc4ce4fd64a789.pdfIn PDF document text
    • https://nulakumoxuguv.weebly.com/uploads/1/3/1/8/131871970/8738440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5f8bb2e23a896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f8e84e0d9272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9689/0262/files/how_to_write_chemical_equations_in_excel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8304/5293/files/vuvarul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/raise_spectre_poe_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/lobamegoka.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/4809849379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f4ea6f-153c-4f57-bfdd-338fa2d919b6/4789943494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a7dde4-f9e4-4d71-9737-99d69f057af8/61806344777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e49738fe-d995-4bb7-a75b-2f1ff7035822/pasulirelegupogi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AC 5120 bytes
SHA-256: 5512fd037b4127a6e83606537dfd5612d132ed7ed3c82f95f9138fcfa881a04c
font_01_sfnt_off0000760f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x760F 10576 bytes
SHA-256: 856a9acf3d19e5fbe8a71ebfa64e4773b50f9ac57170db1eb076da2b87155bb1

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