Malicious PDF — malware analysis report

Static analysis result for SHA-256 88367efcd7ce4eab…

MALICIOUS

PDF

38.5 KB Created: 2020-08-23 08:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db97dfec17285c8d5d21d5c7d723e94b SHA-1: 2c5dc864a8bdf7a4eb1d542b23fb6281aefe4d3d SHA-256: 88367efcd7ce4eab979b1f3db1328e2dea958c4f370510e75a2291f0cb444f71
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for containing a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'ttraff.cc', are highly suspicious and likely serve as the initial stage for a phishing or malware delivery campaign.

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=mitotic+spindle+is+formed+by
    • http://files.oldworldheritagellc.com/uploads/1/3/1/4/131407705/ziradukimoxegop_ziduxonatopazix_xukanodi.pdf
    • http://wuvolu.quincytownship.org/uploads/1/3/1/6/131637240/5b3bc7f.pdf
    • http://files.bamboozlestraws.org/uploads/1/3/1/4/131454581/2882734.pdf
    • http://files.michaelspauley.com/uploads/1/3/2/6/132680986/bf6e43.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/35478385058.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/majoterademipam.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/estate_washing_machine.pdf
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/28608169620.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/xumederasesuvumivisafok.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1265/files/iodine_test_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0434/4823/8236/files/steffi_graf_images_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/50453475210.pdf
    • https://cdn.shopify.com/s/files/1/0433/9639/9265/files/zaliguvigivogoluxe.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b6d.bin
a069ac5fee2b79e566fcac2d21e07d3b16991272340c70138c8e890ef8e33825
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6D 5340 bytes
font_01_sfnt_off00006d84.bin
91b308bcb95dd2d851907106bdabb10370979334d8d47005cc5476e54396295d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D84 9316 bytes