Malicious PDF — malware analysis report

Static analysis result for SHA-256 71badc7e9eaf7b1b…

MALICIOUS

PDF

46.2 KB Created: 2020-08-16 16:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc5e7146a39bae4d7ba8dfe32e8320dd SHA-1: b77826f9f39e94a881eb2ddc4dbc02502ce4e106 SHA-256: 71badc7e9eaf7b1bbe4bff975094682798136ef25d903db96346e0b4b0fd24f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to lure users to malicious content. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning tactic to distribute the malicious redirector.

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=motor+oil+guide+pdf
    • http://lenepe.lorenasantacruz.com/uploads/1/3/0/9/130969352/xuzesosezuvibakafom.pdf
    • http://files.aspoonfulsparkle.com/uploads/1/3/1/6/131637658/7591832b.pdf
    • http://files.lcsupperclub.com/uploads/1/3/0/7/130739170/negimobamunubefel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/95638573209.pdf
    • https://cdn.shopify.com/s/files/1/0435/0384/5541/files/geranalepub.pdf
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/jirularurogupelij.pdf
    • https://cdn.shopify.com/s/files/1/0437/7785/1550/files/avastar_free_2015.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0971/files/mawixafagavurewadivexisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/bahrain_newspapers.pdf
    • https://cdn.shopify.com/s/files/1/0438/6727/5424/files/13112857753.pdf
    • https://cdn.shopify.com/s/files/1/0437/1356/0727/files/tususiwade.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/57155008281.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_off000079be.bin
7850a8162fa0e287c4b134a9971e08fd90b526d21e613d44073c0a372d6d5866
pdf-font-stream PDF embedded font (sfnt) at offset 0x79BE 4828 bytes
font_01_sfnt_off00008a4a.bin
25f313e439b3bd0d791237c94e13d77a2a561da87dfefdf52fde6ddd36651f60
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4A 9980 bytes