Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a582b6ac8262b4…

MALICIOUS

PDF

51.8 KB Created: 2020-08-04 18:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7d465327e1bd16f07dcbd15818b42d4 SHA-1: 982991363164170b012fd59c36f1632ee2230ae7 SHA-256: 14a582b6ac8262b4a18bc3c604679641251139de4246cdb9fc5c871c27751579
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for phishing and malware distribution. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same URL and a search query, suggesting a lure to trick users into clicking the link. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest a phishing or malicious content delivery attempt.

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.com/pify?keyword=short+stories+in+telugu+pdf
    • http://files.mwcatlanta.org/uploads/1/3/1/4/131407796/mamefor-somozede-jisobidaniximi.pdf
    • http://files.sbwga.com/uploads/1/3/2/6/132695829/7282129.pdf
    • http://files.mountpleasantsaundersfoot.com/uploads/1/3/0/7/130738562/pufumowikigaw.pdf
    • http://files.carpetcleanerssantabarbara.com/uploads/1/3/0/7/130775677/8744766.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/toverulugipugofakala.pdf
    • https://cdn.shopify.com/s/files/1/0429/0369/9615/files/tomebivenurafowowowud.pdf
    • https://cdn.shopify.com/s/files/1/0432/9016/5403/files/luvoto.pdf
    • https://cdn.shopify.com/s/files/1/0432/1030/9787/files/65868465464.pdf
    • https://cdn.shopify.com/s/files/1/0438/1592/7965/files/31983572618.pdf
    • https://cdn.shopify.com/s/files/1/0431/9979/1268/files/82857396549.pdf
    • https://cdn.shopify.com/s/files/1/0433/5278/5055/files/nopegukolinur.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/kojuwugixagubo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/70331339895.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zovoxumaf.pdf
    • https://cdn.shopify.com/s/files/1/0441/0854/6200/files/feedback_control_of_dynamic_systems_6th.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/24883652598.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_off000080a8.bin
f0626a50369b5bbdf5f5548e330ad75a5d3c5219e860822c17923d5af5771d28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A8 5196 bytes
font_01_sfnt_off0000924e.bin
1c28b2d6a8386234468e68d28f3510c6e41c781e632560d432f8349c0eeb74f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x924E 15612 bytes

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