Malicious PDF — malware analysis report

Static analysis result for SHA-256 135dde11c46764aa…

MALICIOUS

PDF

38.0 KB Created: 2020-08-22 13:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 524db32d1e14669ad64bf085d4ad907c SHA-1: 4338430b9db1210840807de6270d01085b2db6ce SHA-256: 135dde11c46764aab0a5474e8c4bb8559fe6dc6f92461b99a6a51fb88eda27b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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=apollo+100+joy+sheet+music
    • http://files.illlaladesigns.com/uploads/1/3/0/7/130740625/94f3e9ddfc.pdf
    • http://filex.adelaide-brushfencing.com.au/uploads/1/3/1/3/131381518/zajemosizuwu_xipefuxejalaz.pdf
    • http://files.julietzanniceramics.com/uploads/1/3/0/7/130739212/8487808.pdf
    • http://kunusop.pofarmersmarket.com/uploads/1/3/2/7/132712286/kopomujuwal.pdf
    • http://files.lawtonacademyrobotics.com/uploads/1/3/1/6/131637016/4885668.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4619/8683/files/2125107440.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/38408472845.pdf
    • https://cdn.shopify.com/s/files/1/0437/4695/1319/files/apprendre_l_anglais_grammaire.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ketotojugidumirazi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8567/files/drill_sergeant_modules_army_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/gejazebopuzewufuxipux.pdf
    • https://cdn.shopify.com/s/files/1/0432/2328/5928/files/29773465823.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/rowesixevo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4044/0471/files/43612045397.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39086675177.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_off00005793.bin
a9eb115288b956c71ff398b8370cc2edc273bbe1ab080b96764b43f433a8a5b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5793 5228 bytes
font_01_sfnt_off00006956.bin
975aaedff0c1230f70bacdc6fa8d939bde5870c5faeef9ced5fbf894be345802
pdf-font-stream PDF embedded font (sfnt) at offset 0x6956 9956 bytes