Malicious PDF — malware analysis report

Static analysis result for SHA-256 05df2788be02aa3f…

MALICIOUS

PDF

42.3 KB Created: 2020-08-18 15:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 22c31a25a6198c8d524bd3800a2aff61 SHA-1: 27d1e3119d2b0122851d1398b8d7717272f8f489 SHA-256: 05df2788be02aa3f21e2c20db966b8d126ac3bde3649ff2c2e3fb9faf2d2e675
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be part of the link farm, suggesting a phishing or scam attempt.

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.ru/pify?keyword=meio+ambiente+pdf+livro In PDF document text
    • http://files.fixthepilotshortage.com/uploads/1/3/1/4/131454109/5298952.pdfIn PDF document text
    • http://musawufu.amanapopcornandicecream.com/uploads/1/3/0/7/130739059/4697040.pdfIn PDF document text
    • http://files.smartspraytan.com/uploads/1/3/0/7/130776141/180198.pdfIn PDF document text
    • http://files.petesenoffphotographics.com/uploads/1/3/0/7/130776110/2843535.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/1/0429/5429/3402/files/44143539963.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3246/0960/files/25903457836.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/vitixud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5149/9170/files/lutubedivakexika.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0028/1762/files/kazoverefiru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5316/2394/files/96928848858.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/estimation_of_working_capital_requirement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8466/7297/files/32947196294.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/25164298503.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3294/3519/files/nebaxerexuterusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7292/9435/files/.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_off000063e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E0 5212 bytes
SHA-256: b5b654313ae431da7ac23cb901d6466b6b7baf5640d7226eae6221e39f037f98
font_01_sfnt_off0000758b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x758B 12452 bytes
SHA-256: fe274dbb09d0363f93dd170bcddfcc359757a1c9393757f2c2b8597c3c6ac0d6

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