Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d6ad17303b4a8e…

MALICIOUS

PDF

41.1 KB Created: 2020-08-06 19:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af2719e3ef3e33f6f4ae71af5463a5c0 SHA-1: 9149d6a450256b5eb6b12214951675d68837c3f6 SHA-256: 86d6ad17303b4a8e2b90d05625e3e873659cf703ca98f9fd1696b87208e433a9
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains lures for advance-fee scams and fake invoices, directing users to a malicious redirector URL. The presence of numerous external PDF links suggests a link farm used for SEO poisoning or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the redirector URL is a high-confidence indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=types+of+brick+bonding+pdf
    • http://files.mercaditosustentable.com/uploads/1/3/0/8/130874523/vawipapulemu.pdf
    • http://files.atthehelmbluffton.com/uploads/1/3/0/8/130874233/kenapajixakipovoban.pdf
    • http://files.sugarrimbar.com/uploads/1/3/1/8/131856430/jijopuxugap.pdf
    • http://files.experiencemoretolife.com/uploads/1/3/2/6/132680808/6784098.pdf
    • http://files.minimumbible.com/uploads/1/3/1/6/131637108/6739939.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8072/0294/files/25659213835.pdf
    • https://cdn.shopify.com/s/files/1/0431/7570/6788/files/xajefekoloxijebonarar.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/kekofubabotinar.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1245/files/jodaziwesevibatig.pdf
    • https://cdn.shopify.com/s/files/1/0432/2338/4219/files/carb_count_food_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/cell_and_battery_mcq_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3363/files/puzzle_and_dragons_z_orb_code.pdf
    • https://cdn.shopify.com/s/files/1/0435/3468/0216/files/vejosebarineba.pdf
    • https://cdn.shopify.com/s/files/1/0431/4398/7361/files/fezeja.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3141/files/9631703629.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/51424766386.pdf
    • https://cdn.shopify.com/s/files/1/0431/9979/1265/files/73220901076.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_off00006309.bin
bfe71e219aad3b35107f198dd4248dfdf22c2f96ab1a0e15ccc434defad94d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6309 5336 bytes
font_01_sfnt_off00007552.bin
e1ead45536298e08353d4e0e409de9c94f507fc495ccfc8533ef30aefc07b4b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7552 10088 bytes

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