Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7653bc8ecd93bf4…

MALICIOUS

PDF

44.7 KB Created: 2020-08-28 17:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c4446876db4598d84fcfdde14a8f5f0 SHA-1: d669d1311a87e3c223e2a41a914cf07f3a957ee5 SHA-256: d7653bc8ecd93bf4e2ba24f71cee2f4e7d4df49a36c4e8ee97101be1d33a0b2f
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=olive+oil+and+lemon+juice+for+consti'. It also exhibits a PDF link farm heuristic, with numerous links to shopify.com domains, suggesting an attempt to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and several shopify.com URLs, reinforcing the attack pattern.

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=olive+oil+and+lemon+juice+for+consti
    • http://files.sentrinalipa.com/uploads/1/3/1/6/131636775/linitomaxotut_gewumaziw_razaxomi_gebav.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/suxijamuturez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.pdf
    • https://cdn.shopify.com/s/files/1/0428/2023/9519/files/video_star_apk_softonic.pdf
    • https://cdn.shopify.com/s/files/1/0448/4582/6210/files/airdroid_free_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4447/8874/files/67149000659.pdf
    • https://cdn.shopify.com/s/files/1/0451/0826/5125/files/kreg_cabinet_making_booklet.pdf
    • https://cdn.shopify.com/s/files/1/0431/9336/8725/files/zirasovatokazad.pdf
    • https://cdn.shopify.com/s/files/1/0432/2702/1480/files/kanukijuwibupeborijasa.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/muvixizativised.pdf
    • https://cdn.shopify.com/s/files/1/0437/7572/1629/files/19547023876.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_off00007020.bin
e3795b18f27e584b25ea5fe17c0aaa618affb306fa3189be537ecec9f890c20d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7020 5332 bytes
font_01_sfnt_off00008234.bin
fbcee93ce6824d6b455fcc78286c25b34a1f7faf19cf67da92694f48ce7c2de9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8234 10656 bytes