Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e70d5feb16a92e…

MALICIOUS

PDF

39.5 KB Created: 2020-08-23 17:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2a0eba3412cc38ad4af06ed79a9dcce SHA-1: 98298120d638ce59eaf6131ce71890514f85af35 SHA-256: 07e70d5feb16a92e56de4ae59637fe1f641e894931df7ba755a3a8e04ef10ccb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though partially corrupted, contains the URL 'https://ttraff.com/pify?keyword=vte+prophylaxis+guidelines+2017+malaysia', suggesting a lure to a malicious site. The presence of a large number of external PDF links, many pointing to Shopify, indicates a link farm strategy to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.com/pify?keyword=vte+prophylaxis+guidelines+2017+malaysia
    • http://files.buckinghamshirelandscapegardeners.com/uploads/1/3/0/9/130969300/1552337.pdf
    • http://tupager.kathrynkohorst.com/uploads/1/3/1/4/131454165/3573526.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0460/2216/4639/files/75964087410.pdf
    • https://cdn.shopify.com/s/files/1/0438/4574/6838/files/37791438519.pdf
    • https://cdn.shopify.com/s/files/1/0438/6213/0853/files/94379838368.pdf
    • https://cdn.shopify.com/s/files/1/0433/0763/0747/files/sinusitis_cronica_en_nios_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0461/9121/4743/files/rusijodonojuwiti.pdf
    • https://cdn.shopify.com/s/files/1/0440/6290/0374/files/fepafopuwonibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3296/0409/files/introduction_to_containers_kubernetes_and_red_hat_openshift.pdf
    • https://cdn.shopify.com/s/files/1/0448/0807/7473/files/andrea_catalogos_2020.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_off00005780.bin
8b07723c97b00d6b78522995939d395df545e9bc045d08a5e07203c1fd0a4894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5780 5912 bytes
font_01_sfnt_off00006b91.bin
4d877645a96bae9cf484a0571a22dc73ebafa9d72a502555edaaf9e6d8c2f2ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B91 11780 bytes

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