Malicious PDF — malware analysis report

Static analysis result for SHA-256 718a20ca29db086f…

MALICIOUS

PDF

39.3 KB Created: 2020-08-11 00:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7162d6603a0be5886754e3de1646397 SHA-1: 8285ae3f26866d2e091bacfa7e926934059e18e0 SHA-256: 718a20ca29db086fc542e2c4ad0d6add49f6f38f9ce91060b1bb72621856bc89
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to potentially malicious content. One prominent URL, 'https://ttraff.cc/pify?keyword=azar+grammar+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a lure to download further content. The ML classifier strongly indicates 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.cc/pify?keyword=azar+grammar+pdf
    • http://jiretinid.infiniteecoclean.com/uploads/1/3/1/3/131381679/71a20d5c3620.pdf
    • http://files.vitoshapartners.com/uploads/1/3/2/8/132816202/8a6d740.pdf
    • http://files.rdcapitalpartners.com/uploads/1/3/1/4/131414743/2db5526.pdf
    • http://xivepotot.vfmh.org.uk/uploads/1/3/1/0/131070872/fofibisagapokuki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/zuwexozagu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67295211500.pdf
    • https://cdn.shopify.com/s/files/1/0433/3197/7369/files/dnd_5e_ranged_attack.pdf
    • https://cdn.shopify.com/s/files/1/0433/5520/9879/files/bhutani_nomogram.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/zifurelanosodikabiti.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/binary_options_unmasked_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/jevig.pdf
    • https://cdn.shopify.com/s/files/1/0433/3446/7752/files/84478899693.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/bekadexibefo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/67450331231.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/vizifaluligurew.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_off00005c31.bin
7ad1f6958dfdafcb09bdce7eb159ead5fb50076aefb164283748e3876eb6cc68
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C31 5192 bytes
font_01_sfnt_off00006dcf.bin
5deb69c141b06450f1145b7a7854e12b98f432302859d9f50f235c83a2dea347
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCF 10216 bytes