Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d5c38724fcdb20…

MALICIOUS

PDF

41.2 KB Created: 2020-10-02 21:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4884ccc54fdb9a9466f7128f59b764fa SHA-1: 12e8b244b679e6cb1db7959fd39f3a4bf743a43c SHA-256: 79d5c38724fcdb203ad1406f8f70d1cee6c7b530f1f6f7bdea414eefb70eebfc
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body and embedded link text suggest a lure related to 'the attraction code pdf'. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs indicate a malicious intent to redirect 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 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://cctraff.ru/strik?keyword=the+attraction+code+pdf In PDF document text
    • http://gonira.syandash.co.uk/uploads/1/3/2/6/132683252/feac88a19acc.pdfIn PDF document text
    • http://rubilo.agbio-inc.com/uploads/1/3/2/6/132683130/316ed0b4faced.pdfIn PDF document text
    • http://files.yieeunchun.com/uploads/1/3/0/8/130814297/foxabipuzi.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/1/0486/0238/2504/files/timberleaf_soil_testing_company.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1832/4632/files/emission_of_light_from_an_atom_occurs_when_an_electron.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4780/7895/files/98607984204.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1207/4915/files/14177362148.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0076/8930/files/78579135381.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8113/7316/files/lg_env2_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3391/4275/files/la_maldicion_de_las_hermanas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2960/2205/files/el_capitan_camping_reservations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6089/4627/files/ab_pattern_worksheets_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2cfd438-b21b-4501-bf77-8e3857cfc77f/85653343800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb160df-4daf-49f4-b566-9756e9a5ec0c/74081586695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e60e00-ab11-4698-bde2-3c45c66b8341/vomarujebogivutamob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1fe211-47c3-43e2-b0aa-afb8b77787e3/bifizuzofuti.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_off0000638e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638E 4980 bytes
SHA-256: 2b37492a60b6308e658aa029fe4c067743565e9acf8d4e76afa0f3b812349346
font_01_sfnt_off00007479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7479 10516 bytes
SHA-256: 48921b52fb88452ebe6e6bd4e82e9dc84803e69023347d8f87ebf1df0e182063

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