Malicious PDF — malware analysis report

Static analysis result for SHA-256 853da2360a1e6978…

MALICIOUS

PDF

45.9 KB Created: 2020-08-21 09:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e3e4cf375147381f7136b19e553a16b SHA-1: 66b59dfb625ad73e70a133127bc0f2c47c769936 SHA-256: 853da2360a1e697857b0fba425d243249f4fcee1f7a7b9a07338129c701087af
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/pify?keyword=administra%25C3%25A7%25C3%25A3o+de+marketing+las+casas+2006+pdf. This indicates an attempt to lure users to a malicious site, likely for phishing or malware distribution. The presence of a large number of external PDF links further supports a link farm or SEO manipulation tactic. No scripts were extracted from this sample.

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=administra%25C3%25A7%25C3%25A3o+de+marketing+las+casas+2006+pdf
    • http://putavu.obsidianrenewables.com/uploads/1/3/1/1/131163774/8547438.pdf
    • http://files.litesquares.com/uploads/1/3/1/3/131398544/1236910.pdf
    • http://tuziref.findjasper.com/uploads/1/3/1/4/131482996/14d2c202.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/4912/3993/files/5803252179.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/bexuxevanabuvinopuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1949/files/35923092797.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/acceptance_sampling_in_quality_control.pdf
    • https://cdn.shopify.com/s/files/1/0433/5396/4712/files/nefoj.pdf
    • https://cdn.shopify.com/s/files/1/0440/2121/9493/files/kubativubuwakotesi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/76924262414.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tekutuni.pdf
    • https://cdn.shopify.com/s/files/1/0438/4086/4421/files/labunawufesero.pdf
    • https://cdn.shopify.com/s/files/1/0433/9800/4899/files/kisuselif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fad.bin
6454309a64526cbd5ce8aa7af20104717a4944dda4146fceec63fe1a27bfb547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAD 6244 bytes
font_01_sfnt_off000073ea.bin
8ee40254ea8938350f340ef207bc2db5f40c462de69e730f1ad792699209988c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EA 12992 bytes
font_02_sfnt_off00009a42.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A42 4324 bytes

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