Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fd68eb953e6f2f…

MALICIOUS

PDF

50.2 KB Created: 2020-10-19 04:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 97615e5cafa438901f9a3c8052f3a340 SHA-1: f5008fcd3a4535646eb1c701ee6983e647e66048 SHA-256: a7fd68eb953e6f2fd8f5518454b5e96518d62ec09815d6c9ba01603af6130720
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure at https://gettraff.ru/123?keyword=termoquimica+ejercicios+resueltos+paso+a+paso+pdf. The document body, though heavily obfuscated, contains this same URL, indicating its likely purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/123?keyword=termoquimica+ejercicios+resueltos+paso+a+paso+pdf In PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/domirusasigog.pdfIn PDF document text
    • https://lowizozexide.weebly.com/uploads/1/3/0/7/130776176/2870059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5f880afd1b3b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f8753113811e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5f8bfd7e42209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f8b4c28aa9db.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/1/0438/4007/7981/files/halo_online_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2490/0515/files/ropepuzabu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5478/7477/files/tukuteramofe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2552/3103/files/57418582700.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7562/5653/files/pre_algebra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2253/2251/files/zetuzojuxupexi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8352/9885/files/80770973247.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8675/7018/files/line_break_in_google_sheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9717/1113/files/92813008117.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1609/3335/files/37639784034.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3296/1439/files/lomafa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1673/0277/files/rizilawatudalejafojuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1698/5508/files/the_chemistry_of_biology_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/6667/1271/files/ap_statistics_ultimate_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6130093d-0319-4e0e-9671-cd6f5c0df309/59337911654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c0e3ff-5689-41b0-9623-7afae89a71d1/51379731118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c36035-ec54-4e71-87ca-971fac244be3/manual_gear_knobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f36adc5-1c84-41f4-ba5b-2f00c86ebac6/jepenadutiremidamubemakej.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_off00008139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8139 5452 bytes
SHA-256: e800af45c46d517dfb1199a23ccf19cfe5ae5abbb3b3d9856187cd6269276bd5
font_01_sfnt_off000093af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93AF 11544 bytes
SHA-256: c169128bbf5c6a119b9eb544896baefb29c04af6dbd0f4a5dabd91cdd17110a6

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