Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ec8641f0c21a6d…

MALICIOUS

PDF

44.1 KB Created: 2020-08-02 03:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dddcca0f427a65cdb4bde32906ebf854 SHA-1: ac5beb5b931351d79e0ddb3bcf334843645c427a SHA-256: 75ec8641f0c21a6d94887cc5232f3410445b3f51e9eacc09cad636280351d189
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, appears to reference 'financial accounting for mbas 5th edition pdf', suggesting a lure to disguise the malicious links. The presence of many external PDF links indicates a link farm strategy, likely to distribute malicious content or engage in SEO manipulation.

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=financial+accounting+for+mbas+5th+edition+pdf
    • http://files.manhattanyouthballet.org/uploads/1/3/2/6/132695258/xosaribeduso-bilule-rifivuzomaso-vukedivobux.pdf
    • http://files.mshdesigns.com/uploads/1/3/0/8/130814411/2f2956e5ad.pdf
    • http://files.hossfirearmtraining.com/uploads/1/3/0/8/130873822/093134ea02ec86.pdf
    • http://files.paigetheyogi.com/uploads/1/3/1/4/131409526/2e9d4.pdf
    • http://files.grettaharleymusic.com/uploads/1/3/1/4/131437552/xidijap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8140/8420/files/libuzodevuzenafuri.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/zizubabomizoxezedalesu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15906675896.pdf
    • https://cdn.shopify.com/s/files/1/0434/4528/9112/files/1102158861.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/5000/files/domesasitopumujetil.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/12858735416.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/kuzimosejobuga.pdf
    • https://cdn.shopify.com/s/files/1/0436/6372/0613/files/form_ss-_8.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/gazatelaguratag.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/lufifowex.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_off00006e05.bin
ccd3ff53f465a19a0b146b1ca368e12b75b48d6f0c7ff4e091b27005b2b29ade
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E05 5788 bytes
font_01_sfnt_off00008189.bin
93d4e1bc346ed0028c09a950e3186564acdf0fd5d13a07c07270973c395f4b0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8189 9816 bytes