Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a90fed0154424bb…

MALICIOUS

PDF

41.5 KB Created: 2020-08-21 18:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0264b27c70048aa765edfe600a85a174 SHA-1: d55da54c671bb7e5afdbaac5d0e5b9c9ef39d466 SHA-256: 5a90fed0154424bbbc5aff27bae3ef510d67a5e0d38e34327f5e7568f978bb77
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, disguised with a seemingly relevant keyword. The document body, though obfuscated, also contains the primary malicious URL. The presence of numerous external links suggests an attempt to generate traffic or distribute further 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.
  • 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.com/pify?keyword=signs+and+symptoms+of+pneumonia+pdf
    • http://files.ahacentre.ca/uploads/1/3/0/7/130739786/fb967b.pdf
    • http://files.oregonabslearningstandards.org/uploads/1/3/1/6/131607374/2909f90d544c.pdf
    • http://darifudu.staty.org/uploads/1/3/1/6/131607254/tamijebidoz_jukasibowekofi_mimatexivepemak_zamovadesezi.pdf
    • http://files.brdavid.com/uploads/1/3/1/6/131637374/95083.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0451/8114/1143/files/lagu_ost_lawless_lawyer_memories.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81159011373.pdf
    • https://cdn.shopify.com/s/files/1/0431/4975/4519/files/zudugosi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9862/7495/files/xipawopob.pdf
    • https://cdn.shopify.com/s/files/1/0450/8162/4739/files/44737741301.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/raxurazolete.pdf
    • https://cdn.shopify.com/s/files/1/0435/7786/8443/files/76238282801.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/26659167986.pdf
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/watch_mac_and_devin_go_to_highschool.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/small_size_android_emulators_for_pc.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_off000063a3.bin
16dc0cb63a33768947da2af85e3f92033883e32bbb0de8c38c0c9dc93ea895ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A3 5440 bytes
font_01_sfnt_off00007619.bin
9d81a7de7d4d911f7b5d0be70be6879e7f4946b7b94e4ff8d686260f1484c6b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7619 10252 bytes

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