Malicious PDF — malware analysis report

Static analysis result for SHA-256 657841d4087fcd72…

MALICIOUS

PDF

43.7 KB Created: 2020-08-06 09:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32a7aaa0dd9c17e976629eba1b974b8e SHA-1: d698e54b522341c238b048c02ee9103c098dc2f6 SHA-256: 657841d4087fcd72128a637da996e7821c9b6e58cbfd17d1a4313499be5feab7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on various domains, suggesting a link farm or SEO spamming operation. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is likely used to obscure the final destination of the malicious payload. 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.cc/pify?keyword=causes+of+academic+stress+pdf
    • http://fexopafav.education-pathways.com/uploads/1/3/2/6/132681946/20a11d174a5.pdf
    • http://files.nicoleshanks.com/uploads/1/3/0/7/130776168/romomukepa-wifixufezodov-laguvi.pdf
    • http://files.fbcmtsterling.com/uploads/1/3/0/9/130969254/2146944.pdf
    • http://files.aexist.nl/uploads/1/3/1/4/131408024/nureposepeveg_fepoma_zidefimer_gebijijasa.pdf
    • http://files.southernhomesandgardens.com/uploads/1/3/2/8/132815054/lofopewulipumi-pulezaribabamit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/68591752845.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/71288841418.pdf
    • https://cdn.shopify.com/s/files/1/0437/8545/3728/files/23777528253.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/64324859046.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1402/files/86620054557.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/24904031890.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/dewozidotevipapujuvowoz.pdf
    • https://cdn.shopify.com/s/files/1/0436/3704/7449/files/cashless_policy_and_economic_growth_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0431/4264/3868/files/47939411083.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/tda2020_bridge_amplifier_circuit.pdf
    • https://cdn.shopify.com/s/files/1/0433/6821/8780/files/pressors_and_inotropes.pdf
    • https://cdn.shopify.com/s/files/1/0434/1914/0252/files/writing_alphabet_letters_worksheets.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_off00006dff.bin
b2587f435789d2adaf7586e7311e3fa66e94adac0ba0e85cbc32d0d52c610507		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFF 5172 bytes
font_01_sfnt_off00007f7f.bin
ca28ae36e1c632dbafbc326a8df1ad88d301633f592c162e93ace020acc6c4a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7F 10060 bytes

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