Malicious PDF — malware analysis report

Static analysis result for SHA-256 9077c03fb21541a1…

MALICIOUS

PDF

44.6 KB Created: 2020-08-13 22:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3427a7d1b2fd707a27b49bb31eeb8345 SHA-1: 71bc2a9120bb23bf0db041e1c6bd7814b23f6318 SHA-256: 9077c03fb21541a1c3b3591ad91abd3491c078f8c4422635310da25e6a0b73f2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'animation creation app for android' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous external PDF links also indicates a link farm, likely for SEO manipulation to drive traffic to malicious sites.

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=animation+creation+app+for+android
    • http://nejowef.murchiebhs.com/uploads/1/3/0/7/130740178/fabitikuwoxudub-zebazam-fuseza-moperodumaraj.pdf
    • http://files.missions4jesuschrist.com/uploads/1/3/0/9/130969352/jawijuxitad.pdf
    • http://files.calgaryswsj.com/uploads/1/3/1/6/131606819/9031315.pdf
    • http://wekogu.bridportlionsclub.org/uploads/1/3/1/4/131408027/6818232.pdf
    • http://files.allegrodancemusic.com/uploads/1/3/0/7/130740054/fovozo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3305/1814/files/42536039265.pdf
    • https://cdn.shopify.com/s/files/1/0432/8400/5032/files/zamorovumifewuwotov.pdf
    • https://cdn.shopify.com/s/files/1/0447/4057/5381/files/icecream_split_and_merge_software.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1638/files/83561847315.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/arteriografa_cerebral.pdf
    • https://cdn.shopify.com/s/files/1/0431/0951/5413/files/31815924574.pdf
    • https://cdn.shopify.com/s/files/1/0430/9739/1261/files/68129182974.pdf
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/pusemenukodoneritojon.pdf
    • https://cdn.shopify.com/s/files/1/0433/5845/3918/files/sutibabuzinib.pdf
    • https://cdn.shopify.com/s/files/1/0428/6529/5526/files/tipawaxebipuvige.pdf
    • https://cdn.shopify.com/s/files/1/0435/9746/3715/files/62555359187.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070c0.bin
02a9e5432da6918df29d52fe6063e5db9441112e07ef8e38f2ca7098978eda0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C0 5080 bytes
font_01_sfnt_off000081e3.bin
ea5190d6ad820f2b71614aaee957c29899a65fbb0657901dbcf7de98cfb9e135		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E3 10344 bytes

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