Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b573500a5687573…

MALICIOUS

PDF

44.2 KB Created: 2020-08-06 08:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 993048571dce3cbf8f9288b3074d5148 SHA-1: 6053ed9bd74c98457a9bf8edcabde2140e743942 SHA-256: 6b573500a5687573d6271b338cbff04b431c798a2ae085e753be358bc30d689e
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site or download. The document body also contains numerous links to external PDFs, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=kellogg+casebook+pdf
    • http://files.dartendistrict.com/uploads/1/3/1/8/131856381/jarukid.pdf
    • http://files.wyndcharmsilkenwindhounds.com/uploads/1/3/1/3/131379402/34e2f602cdb588.pdf
    • http://files.mygrapplingvideo.com/uploads/1/3/2/7/132740278/losijowixasisi.pdf
    • http://files.budget-georgia.com/uploads/1/3/1/4/131483148/34629857.pdf
    • http://lemorado.ctmaple.org/uploads/1/3/0/8/130874317/bukajupulupima_jiwevejamopixe_miwenirologugo_vepizinobamok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2743/9526/files/xugezezotadet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mesibilefonupas.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/google_dorks.pdf
    • https://cdn.shopify.com/s/files/1/0439/4477/1739/files/biochemistry_all_test.pdf
    • https://cdn.shopify.com/s/files/1/0437/0720/3739/files/97729219020.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/96117102320.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/79808163785.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9960/files/18941536619.pdf
    • https://cdn.shopify.com/s/files/1/0437/6877/4814/files/45900520575.pdf
    • https://cdn.shopify.com/s/files/1/0440/7109/2376/files/25309516925.pdf
    • https://cdn.shopify.com/s/files/1/0433/8375/0821/files/pakovikuxasuxiduru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/jobozowuwuzizutinonubotu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f75.bin
fc95219ab6410f57bd09f1f7387e67e19b80b282f6917e6d523da9db7957856b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F75 5400 bytes
font_01_sfnt_off000081ec.bin
f1e27197f85ba2e103ed11c0da97ff1fbc4fbee9bf2cd50ee88f25213772c761		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81EC 10396 bytes

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