Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c18d01df5ec568d…

MALICIOUS

PDF

43.2 KB Created: 2020-08-30 07:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1615f2058683bd0a81d7860ceaae4ee3 SHA-1: cf6af70473ebce5437d2c8552d89ba40f028dc87 SHA-256: 4c18d01df5ec568ddbdcdbe028ca2721ed418a302355383bc195322865984abc
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be part of a SEO spam campaign. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking Shopify URL, likely used to disguise the malicious intent. The presence of numerous PDF links in the document further supports the SEO link farm heuristic.

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/wix?keyword=geetha+govindam+hindi+download+filmy
    • https://cdn.shopify.com/s/files/1/0431/5919/1712/files/tavutiniviwawodidemotodo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/zinowesapafubagoboru.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/91689670845.pdf
    • https://static.usrfiles.com/ugd/8b2c09_093a3566045846d2943bfbc9d53a22d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7ca450560b54881aa546c7506a69fa7.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_13bfba529cca4994adcc966f3884e00e.pdf
    • https://static.usrfiles.com/ugd/3b47cb_f430d1e9703046f7ae945470bbfb9735.pdf
    • https://static.usrfiles.com/ugd/b8c837_1259ee260f034bf587892fdf773500c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_102fd65e56ab4c76b67f2895b60e47d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_83ba5ee8599c4a0ea84626160cbd7743.pdf
    • https://static.usrfiles.com/ugd/34ec99_639c65c026684eba8fe4510b36d2635c.pdf
    • https://static.usrfiles.com/ugd/b8c837_4afe074db90c414882ada8697861c3ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_c73477439cc14087a76c724466a4ec3f.pdf
    • https://static.usrfiles.com/ugd/b58d21_149b771ab1634f6084cee00871561df2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f1b.bin
073a0c82d56c65aea0a4017c7c57c180c9742389c9fe1ffcedd5c4eb764525a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1B 5120 bytes
font_01_sfnt_off0000707d.bin
5e58466f3c3c9678eeae263ad361953d98337f04feb1ac9848d659e99d6c7bbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x707D 9716 bytes
font_02_sfnt_off000091d7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x91D7 4324 bytes