Malicious PDF — malware analysis report

Static analysis result for SHA-256 685c0d864ef4cbe0…

MALICIOUS

PDF

38.1 KB Created: 2020-08-22 16:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edec6272e6b8861a0dda81398be74abe SHA-1: c9698e2d9d0373810aad5b83063cacea175ef6ef SHA-256: 685c0d864ef4cbe0ac7868174ae6f26b8174486119a979837c49da2da811aa1c
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text suggesting a lure related to free sheet music. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links, including the malicious redirector, suggests an attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes.

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=free+sheet+music+for+clarinet+choir
    • http://files.yachtrock.biz/uploads/1/3/1/4/131406701/weketowage_sarokowe_xodazizi.pdf
    • http://files.trapwingfestival.com/uploads/1/3/1/4/131408970/kitirefonug.pdf
    • http://files.willisband.org/uploads/1/3/0/8/130874683/denim-pizorikur-nepupigasetibul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4015/2479/files/knowledge_processing_and_applied_artificial_intelligence.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/64467356028.pdf
    • https://cdn.shopify.com/s/files/1/0434/7668/0870/files/22101690783.pdf
    • https://cdn.shopify.com/s/files/1/0435/9946/2558/files/36641858581.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0440/9432/4888/files/gepalowivisu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/48283759715.pdf
    • https://cdn.shopify.com/s/files/1/0434/4066/8838/files/detab.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4840/files/why_do_atoms_form_bonds.pdf
    • https://cdn.shopify.com/s/files/1/0431/3186/3202/files/43315472446.pdf
    • https://cdn.shopify.com/s/files/1/0454/7280/9126/files/bloons_td_5_monkey_lane_impoppable_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/45594047335.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_off000056c3.bin
92ea23e189218b687e78829f389aecded0aba7c5e09efee7640cc3ef3b665da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C3 5076 bytes
font_01_sfnt_off000067e4.bin
37685821f9eeac4f0827969cff3191dfaf1e0c8810750e49be4d206d02e5e8ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E4 10436 bytes

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