Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee7a4c87768b223…

MALICIOUS

PDF

46.6 KB Created: 2020-08-11 03:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85e30abdfc9ccec003788f7e74eff4bf SHA-1: e84c11d97281bf4ae77f4ddb2610762b132ed361 SHA-256: 5ee7a4c87768b223787d38f32c8799ea1cd02f5e0b79593e0fdef9788fa6a7b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body is heavily obfuscated and contains a URL that appears to be part of a link farm or SEO poisoning attempt, likely to lure users to malicious sites.

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.com/pify?keyword=artificial+selection+in+animals+pdf
    • http://files.elementalascension.com/uploads/1/3/1/4/131437953/gawogilopog.pdf
    • http://files.k9perfectiontraining.com/uploads/1/3/1/4/131455158/wuderaninure.pdf
    • http://files.ontcmc-comc.com/uploads/1/3/1/4/131455832/pirobabigepifezenix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2270/4030/files/3565822702.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/najugev.pdf
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/96128491521.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/solaritajuva.pdf
    • https://cdn.shopify.com/s/files/1/0437/7798/2626/files/15753990737.pdf
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/operations_with_rational_and_irrational_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/81916692171.pdf
    • https://cdn.shopify.com/s/files/1/0434/1799/3366/files/nevagasutirolifepef.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/89155586443.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2614/files/dekopul.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/xazinofiletowan.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4741/files/93441510600.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fcb.bin
28ad255f1fa889ac0c07ddbe9d1ee575f4ff925cc9f9448dba7a97e6b1fdd698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCB 5288 bytes
font_01_sfnt_off000071a0.bin
6004530d2f6249347d723c498ebc5e1d1807ecf862aae5f3f49581f6807c8190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A0 10768 bytes
font_02_sfnt_off0000968b.bin
91c30074f85501cb5fe9baf33f35f843940bfa30be12b849312283e920dd8f5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x968B 16488 bytes

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