Malicious PDF — malware analysis report

Static analysis result for SHA-256 5540e51293177a2d…

MALICIOUS

PDF

46.2 KB Created: 2020-08-22 20:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fca64491e7ec0560c6673054d351298 SHA-1: ad445dd15e801bea44ceba27ec58b5bdfdceef0d SHA-256: 5540e51293177a2ddaae1c950c3eca250bb85637c64627ae34fb137a32ee5cc4
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links pointing to external resources, characteristic of a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body contains text related to 'key informant interview questions community assessment' and metadata indicating it was generated by wkhtmltopdf, suggesting a potential lure for users seeking information. The presence of numerous shopify.com URLs, some marked as benign, alongside unknown domains, indicates a broad distribution strategy.

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=key+informant+interview+questions+community+assessment
    • http://vakonow.doublejoutfittersny.com/uploads/1/3/1/6/131606271/2717341.pdf
    • http://files.jjsdeepcreektubes.com/uploads/1/3/1/8/131871569/mifiw.pdf
    • http://dorev.mwenya-uganda.org/uploads/1/3/2/7/132740449/f01c0271.pdf
    • http://files.spartanburgrepertory.com/uploads/1/3/2/6/132681836/3615501.pdf
    • http://files.eogburn.com/uploads/1/3/2/3/132303175/xepagaminozuzu-xesasataguwidun.pdf
    • https://cdn.shopify.com/s/files/1/0430/3847/4397/files/4086456700.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/gimifofe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4329/files/jakavevekit.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/peptic_ulcer_disease_pathophysiology.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4996/files/rodijuvudomen.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3965/files/ejercicios_bisectriz_y_mediatriz_6_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0463/3952/2717/files/47563579438.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/21986391423.pdf
    • https://cdn.shopify.com/s/files/1/0440/2806/7990/files/64055807931.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/9609827834.pdf
    • https://cdn.shopify.com/s/files/1/0433/5452/1758/files/online_payment_form_template_html_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/8648/7455/files/communist_anime_girl.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069a8.bin
a8b03c871b5d2459514837eb7d46cc95a92a0b877ebd95694dea2c4cf0f4384b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A8 5224 bytes
font_01_sfnt_off00007b77.bin
9bbb0cf93232f7cff3911599ad38ed2c31ec118b843c3b3bfe651abc2107d366		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B77 9988 bytes
font_02_sfnt_off00009d2e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D2E 4324 bytes

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