Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac482cd9c67cb52c…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 07:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4b33561311261d79ee70f758a0a2816 SHA-1: 6f3cd60ff252d6abaa34de98c1fc9c4dd7642c33 SHA-256: ac482cd9c67cb52c43c3f6b4467dae4d99a6c09d70eaee99e7dab9e412091421
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=mcps+2020+20+calendar+pdf'. This indicates the document's primary purpose is to lure users to this malicious URL. The document also contains a large number of embedded external PDF links, many hosted on Shopify, which is flagged as a PDF link farm. While some Shopify links are benign, the presence of the malicious redirector suggests a coordinated effort to distribute malicious content.

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/pify?keyword=mcps+2020+20+calendar+pdf
    • http://files.modelmefamous.com/uploads/1/3/2/6/132682829/zogisun_vogil.pdf
    • http://lesoner.tanglewoodvillage.com/uploads/1/3/0/7/130776436/losapuj.pdf
    • http://files.brookfieldbackstory.com/uploads/1/3/1/3/131383864/rewozorukonomu.pdf
    • http://files.guillome.nl/uploads/1/3/0/7/130738852/jijun_sapusepazuremex.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1255/files/18673507737.pdf
    • https://cdn.shopify.com/s/files/1/0432/2433/4498/files/46426261062.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/555_timer_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0436/7620/5209/files/59320915264.pdf
    • https://cdn.shopify.com/s/files/1/0430/7392/9378/files/es6_abstract_class.pdf
    • https://cdn.shopify.com/s/files/1/0434/7651/7014/files/10626999647.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4685/files/13323049860.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/zesefujiker.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/30892723809.pdf
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/44529221830.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0319/files/gezugovinibalisawazav.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/gujuranerowivefafirivuvi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064c4.bin
6639811b33f76165072ada9c6cc6de27a4fa17f28266d5b405d7de5fda81696e
pdf-font-stream PDF embedded font (sfnt) at offset 0x64C4 5428 bytes
font_01_sfnt_off00007744.bin
8b55d720e5335afbdf9f7769b5e9453d2e46ab146bafbab2ac6fd43733230523
pdf-font-stream PDF embedded font (sfnt) at offset 0x7744 10540 bytes