Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd92f33bb518984…

MALICIOUS

PDF

45.7 KB Created: 2020-07-09 01:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efa38573d1477e5f7778e877945f8cb3 SHA-1: 98796ac905d0f25bba79f5a268da53a34ffff37c SHA-256: 3dd92f33bb5189844d48ae53642fee2b6da3b1f64ae14a96f3eeebc77ac6f073
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded links, including one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'intereses personales' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous other PDF links indicates a link farm strategy.

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/wb?keyword=que%20son%20los%20intereses%20personales%20pdf
    • http://files.allfloorsinteriors.com/uploads/1/3/0/9/130969375/kexajize.pdf
    • http://files.iananthonycoleman.com/uploads/1/3/0/7/130776718/9342694.pdf
    • http://files.upwellings.com/uploads/1/3/1/6/131607174/c3eb020e.pdf
    • http://files.tylertutor.com/uploads/1/3/0/7/130739910/6cffa8ed.pdf
    • http://files.pabloardiles.com/uploads/1/3/1/1/131164567/1a908b980a1b.pdf
    • http://files.robingibsonart.com/uploads/1/3/1/3/131384552/7455251.pdf
    • http://files.dhbarker.com/uploads/1/3/2/6/132695333/pefuvomo.pdf
    • http://files.caregiverinspirations.com/uploads/1/3/1/0/131069875/6348f0d6.pdf
    • http://files.sophiagardiner.com/uploads/1/3/1/3/131382406/mobar-pitaw-zamotigovufu.pdf
    • http://files.beitnachum.org/uploads/1/3/1/4/131483253/ximegigojepirez_rabisosip_suwupisi.pdf
    • https://gutekod.files.wordpress.com/2020/07/bafolere.pdf
    • https://vedasigup344424862.files.wordpress.com/2020/06/77470180610.pdf
    • https://jemoxevirez.files.wordpress.com/2020/07/78737139364.pdf
    • https://dojobavoviz.files.wordpress.com/2020/06/15874679880.pdf
    • https://lorabipuv.files.wordpress.com/2020/07/11221994209.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7082322425.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.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/
    • https://cdn.shopify.com/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000716a.bin
9d64bccd0dc565d42dbd6fc429a6602b2874ea755a0a7ab98ab33bc6a0bc6401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716A 4980 bytes
font_01_sfnt_off0000825c.bin
3af5942b2c763d84484e1d1ddb772290aa605f7e8d5ccb4209af47d43614d4e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825C 11744 bytes

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