Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a3c1cdb307cfbb…

MALICIOUS

PDF

56.8 KB Created: 2020-09-02 07:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 389c84c434ffce4acb543727031862aa SHA-1: d2a2b299f7e2e9f0c17196debfa41f7315014166 SHA-256: 12a3c1cdb307cfbb1f0cefb74c27df4349b596357924025890d527e6f667a772
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to a malicious site. The PDF also contains a large number of external links, indicative of a link farm, which is a common tactic for SEO poisoning and distributing malware. No scripts were extracted from this sample.

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/wix?keyword=share+chat+app++in+tamil+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4078/3008/files/gigizoxatibo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1682/files/fiscal_week_calendar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/8144/9118/files/assignment_abroad_newspaper_down.pdf
    • https://static.usrfiles.com/ugd/11276f_57ec0efcfb454621a16645d9309a508d.pdf
    • https://static.usrfiles.com/ugd/4d6844_131f09b9bc6a4ee1997d68329da313eb.pdf
    • https://static.usrfiles.com/ugd/7198c1_99444c097e984d72892232139e391608.pdf
    • https://static.usrfiles.com/ugd/7041e4_f622e97278054f76ae8036c74ae9eea6.pdf
    • https://static.usrfiles.com/ugd/b8c837_3afd7d5d8d3d48d780e46f3371c6f3cd.pdf
    • https://static.usrfiles.com/ugd/f63f29_ee6d4096295a48bd96f816876486e5ce.pdf
    • https://static.usrfiles.com/ugd/4b7290_f4b825f8a5884c62a4f50ede2ea6763f.pdf
    • https://static.usrfiles.com/ugd/64e449_4b0c772071bb4034af610113740795af.pdf
    • https://static.usrfiles.com/ugd/003b86_3a7debe1e00b47baa46b2f2c1e785e51.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_1c7bbf2bea054c76854c6f0c71ab03eb.pdf
    • https://static.usrfiles.com/ugd/e66789_d698f1de70874f3c88a7c6d4967880b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_520695429b8040a68507a86bffe1995b.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ed5.bin
c6f308348cf985b50ab2a5b1c03233199345cd9ffc6150c8439b14dcdef36131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED5 5164 bytes
font_01_sfnt_off00007034.bin
e96930dd8b073ef0957b142208fe895d90c4313036743e3f974665f331fc466a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7034 15668 bytes
font_02_sfnt_off00009ba8.bin
a6f421f9514dba201805afb6dfd422fbc5f36ca601dfc400cbf443776ee4ab4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA8 10516 bytes
font_03_sfnt_off0000bf9a.bin
14a401620d2ff3be902b6993dc442a9deb2c23b20ce8a6d1570e08441770a3c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9A 16496 bytes

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