Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0a2cf10a9825e0…

MALICIOUS

PDF

41.5 KB Created: 2020-08-06 14:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf7b821c155df761c3f6b50761df42c0 SHA-1: df592faac77193ffa3cd02b0096af1829f0fb2ab SHA-256: 5f0a2cf10a9825e09caa70420830a57053891a1eab5b465b2d5e764d169e5b2e
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting a link farm or phishing attempt. The document body, though partially obfuscated, contains text related to 'anti aging foods pdf' and the malicious URL, indicating a lure. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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=anti+aging+foods+pdf
    • http://files.carverdance.net/uploads/1/3/1/6/131607467/2cc101ca27abbc.pdf
    • http://files.boisebrunchbabes.com/uploads/1/3/0/8/130874207/xafuzatokenaf.pdf
    • http://files.breezypointdermatology.com/uploads/1/3/0/7/130776850/0043f9fc4f819.pdf
    • http://files.fastblueprints.com/uploads/1/3/0/8/130874524/fanolagev_daxunazenizopur_tavimipil_lewazovisoxopi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5940/3157/files/bergman_spaces.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/gaxasatoli.pdf
    • https://cdn.shopify.com/s/files/1/0432/0552/5661/files/40969606732.pdf
    • https://cdn.shopify.com/s/files/1/0438/3188/5986/files/32797839153.pdf
    • https://cdn.shopify.com/s/files/1/0431/0076/6369/files/95663167080.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/ged_social_studies_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/4818/9603/files/tinamilefizasazoforu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/wivedadojugiruweriwaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/venoxawimotebikafabijaned.pdf
    • https://cdn.shopify.com/s/files/1/0433/0985/8984/files/tupegix.pdf
    • https://cdn.shopify.com/s/files/1/0431/7115/2023/files/kutojobox.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_off00006438.bin
50b87032e628b70fda1002a1dc055e83b209eba29dcd190c868ddb5931b35ebe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6438 5072 bytes
font_01_sfnt_off00007596.bin
5293ffb6846ed50b81ab169377083b65ceb96c11606822d46b42ef7e1714508a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7596 10524 bytes