Malicious PDF — malware analysis report

Static analysis result for SHA-256 109e68f50123a3c8…

MALICIOUS

PDF

33.6 KB Created: 2020-08-18 15:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00e81376f51d9a4b1216d72bb2cd0c57 SHA-1: 5506be720ce7f187c5bbca46a7a38ae3622e9f17 SHA-256: 109e68f50123a3c819bb89879698039d37a602554b57db14b8d8dc8ab9660069
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to host malicious content. One critical heuristic identified a link to a known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to disguise the malicious intent. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence indicate a malicious document, likely intended to redirect users to harmful 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=cutting+edge+pre+intermediate+third+edition+pdf
    • http://runekig.colquittcountysaddleclub.org/uploads/1/3/1/4/131482962/nofas-tiwir-bisafobugevejo-puzedadule.pdf
    • http://files.holycrosscatholicchurch.net/uploads/1/3/1/1/131163943/makomotoxivi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4151/3894/files/55675279719.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/problem_solving_skills_training.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/jejasirawarorutukubiduw.pdf
    • https://cdn.shopify.com/s/files/1/0435/8098/1407/files/53923049505.pdf
    • https://cdn.shopify.com/s/files/1/0430/7245/4807/files/ny_times_crossword_answers_10_24_19.pdf
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/xutoxasobo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/nijajakeruxumezolefav.pdf
    • https://cdn.shopify.com/s/files/1/0435/4880/3227/files/4037732137.pdf
    • https://cdn.shopify.com/s/files/1/0433/7028/3173/files/marine_corps_survival_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/3856/2712/files/39833365260.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4917/files/college_accounting_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/segogu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6206/files/zutakupusitumeluzewuv.pdf
    • https://cdn.shopify.com/s/files/1/0447/9506/8565/files/pulse_width_modulation_book.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_off00004708.bin
ded27f71d83f5dd7589a0471fb006cc801886b2e29c3c9c8c4af1295a968924f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4708 5148 bytes
font_01_sfnt_off0000585e.bin
2266f17c8e3aa62da069e66e25305a9992f9910d0a459a36edd10469c85d0336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x585E 9620 bytes

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