Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd29f56599e327b…

MALICIOUS

PDF

33.2 KB Created: 2020-08-18 16:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecca19191a705ddf5c43452b6dc452ec SHA-1: 433a12e7b3a880936e6da478fff5f137ad71b45b SHA-256: 3cd29f56599e327b41dea48a925e63a62a236554535f35172a75fd6f232bbf21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a malicious URL, disguised as a 'Boohoo returns label'. This is further supported by heuristics indicating a malicious redirector link and a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary intent appears to be social engineering users into visiting a malicious site.

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://ttraff.cc/pify?keyword=boohoo+returns+label
    • http://zexinu.pristineyc.com/uploads/1/3/1/4/131483281/5481760.pdf
    • http://mevakeke.credit-hours.com/uploads/1/3/0/8/130814328/db19873f3.pdf
    • https://cdn.shopify.com/s/files/1/0438/3653/9045/files/wikekodalivulege.pdf
    • https://cdn.shopify.com/s/files/1/0448/0781/5334/files/kavevavotajonofi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1727/files/wordly_wise_book_7_lesson_11_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/restroom_pass_google_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/9309/6600/files/46422943054.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/dispositivos_de_almacenamiento_magnetico.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/fenuwexopiwipij.pdf
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/80718861549.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044cc.bin
4bb9f36c0f3476d1b5a52133c302a4e126a821c75c695cf3e7ed37632f0a7833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44CC 4964 bytes
font_01_sfnt_off0000559f.bin
1f53f03c2dcd66a8bc331b399aaec98dd61b8f42d17b986f69a404de6df26770		 pdf-font-stream PDF embedded font (sfnt) at offset 0x559F 10224 bytes

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