Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce4654a4551116f…

MALICIOUS

PDF

37.0 KB Created: 2020-08-06 01:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3990a9788a3678a90394d33bc0b491f5 SHA-1: e3eb3669abde1604b49af4c4b151b52796bc2c13 SHA-256: 7ce4654a4551116fa54ad6fe4ade0cd7d3b94cb37eae4810325485e5977a840c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to downloading a PDF, suggesting a lure. The presence of a link farm and the ML classifier's high confidence further support malicious intent.

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=advanced+language+practice+3rd+edition+pdf+download
    • http://files.oregonbiomedicalassociation.org/uploads/1/3/0/7/130775509/rupulidedima-kovalonefazuza.pdf
    • http://files.advancedmedphysics.com/uploads/1/3/0/7/130739625/1380534.pdf
    • http://files.allcoinspections.com/uploads/1/3/1/3/131384635/lofele_seduruxule_musaguj_womemafofebeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/zuzeritujuwewon.pdf
    • https://cdn.shopify.com/s/files/1/0431/7446/1589/files/jopafibefubofugoka.pdf
    • https://cdn.shopify.com/s/files/1/0433/6327/0815/files/wijiwebexogesu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/silagugabikama.pdf
    • https://cdn.shopify.com/s/files/1/0434/7455/0950/files/karabovukipevagojakago.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/lelifodizan.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/75969847486.pdf
    • https://cdn.shopify.com/s/files/1/0433/3669/5959/files/power_electronics_based_projects.pdf
    • https://cdn.shopify.com/s/files/1/0432/5300/6494/files/fevaref.pdf
    • https://cdn.shopify.com/s/files/1/0435/3202/6008/files/tinawiliwimepifozuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/88525106213.pdf
    • https://cdn.shopify.com/s/files/1/0431/7478/9281/files/62058300920.pdf
    • https://cdn.shopify.com/s/files/1/0428/6224/8095/files/lowes_bedford_nh.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63912397784.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_off0000471c.bin
beeb9528079621b6f6b250a15d1b039d3b9c2216461e21979afdab2393350674		 pdf-font-stream PDF embedded font (sfnt) at offset 0x471C 5332 bytes
font_01_sfnt_off00005962.bin
dec6aa4e37253fc64ee7288c07a807ff0386a6620042c06bd840d05248f72169		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5962 9188 bytes
font_02_sfnt_off000078a9.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A9 4324 bytes

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