Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b02cbfea9f7823…

MALICIOUS

PDF

44.6 KB Created: 2020-08-17 00:39:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dcdb26086714c98ac2631a40d77c94e SHA-1: ca36026e6d53c763ea8f89c5c30802a59349bdd7 SHA-256: 78b02cbfea9f7823bce09026e99f900576a83196cd1dada91cc5d6d266b59b65
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified as 'ttraff.cc'. The document body, though partially corrupted, suggests a lure related to 'interview questions for accountant', which is likely a pretext to disguise the malicious intent. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm designed to obscure the true destination and potentially manipulate search engine results.

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=interview+questions+for+accountant+with+answers+pdf
    • http://zezavof.4muttspetspa.com/uploads/1/3/0/7/130738970/fa04c8c2cb4a.pdf
    • http://fajivajep.daytonaramblings.com/uploads/1/3/1/4/131453698/xinoxuso.pdf
    • http://lukawa.propt.net/uploads/1/3/1/6/131637284/mawepa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/0033/8331/files/the_journalists_guide_to_media_law.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/3679840082.pdf
    • https://cdn.shopify.com/s/files/1/0438/2670/8637/files/surerubekixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/duruporem.pdf
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/16537964462.pdf
    • https://cdn.shopify.com/s/files/1/0446/9257/0268/files/lord_of_the_flies_chapter_7_9_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/0461/7119/files/asymmetric_information_in_financial_markets_introduction_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/85068824552.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_off000070ae.bin
6b36c9204c3e53907a1021f4e5578ac5683b96dd6f79546cfe46e317e1ec4db3
pdf-font-stream PDF embedded font (sfnt) at offset 0x70AE 5424 bytes
font_01_sfnt_off0000832d.bin
456b32b43780e0a17ca47c52467a0a0d67e19e2c8a69cd6c72f4419216c17f86
pdf-font-stream PDF embedded font (sfnt) at offset 0x832D 10164 bytes