Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed4a76970b13348…

MALICIOUS

PDF

42.6 KB Created: 2020-08-09 04:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9fdb190c65a27bb95a0d74028893d6d SHA-1: fe722b72debed676e0e0b0202282066266f0fe68 SHA-256: 7ed4a76970b13348006c61cf9c7a043ba30fd13e20339baef48f90662a90e9fd
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm for SEO manipulation or malware distribution. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=astm+a105+pdf+free+download'. The document body also contains urgency language, further supporting a malicious intent to trick users into clicking malicious links.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=astm+a105+pdf+free+download
    • http://files.houseofbargains.shop/uploads/1/3/0/8/130874620/lurubuguwulak.pdf
    • http://pufam.evansms.com/uploads/1/3/1/6/131607712/483764cd.pdf
    • http://files.discoverybayyachtharbor.com/uploads/1/3/1/4/131437949/pokidavimojelunepe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5506/2948/files/42861215999.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5360/files/verbal_and_nonverbal_communication_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1714/2433/files/84062749409.pdf
    • https://cdn.shopify.com/s/files/1/0437/7129/7943/files/vuwodafugejefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wozofedotomutigetipire.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/a_pathfinding_unity.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/pilesotesomixakasisi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/kepesewesogi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/gafudikinawakisiko.pdf
    • https://cdn.shopify.com/s/files/1/0430/4958/2743/files/gibaditapetijoji.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_off00006867.bin
96cf30bc6a122f291c72e72dd3068ff255b405f548e35e609235913f632cd04f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6867 5588 bytes
font_01_sfnt_off00007b68.bin
c6fabe88917c5a2fe85e635ad9a86bec4339038c61441cbbb0590c664cc07d55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B68 10152 bytes

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