Malicious PDF — malware analysis report

Static analysis result for SHA-256 734c32ea0c37c24c…

MALICIOUS

PDF

42.1 KB Created: 2020-08-18 19:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee834945cd99cf2463a3a5e8a47b9c50 SHA-1: f2312e54479bcf386baea7d7d239638958401b12 SHA-256: 734c32ea0c37c24c4b0866dab0e539b8fc9c9c4c753590b5ab2825f13d3b36ad
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=schedule+template+weekly+pdf'. It also contains a large number of external PDF links, many of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious URL suggests a phishing or redirection attempt.

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=schedule+template+weekly+pdf
    • http://files.beepbeepafrica.com/uploads/1/3/1/4/131438692/ddefdee5939bc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7595/3049/files/sabejadaxifafalusaga.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/balanceamento_redox_exercicios.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/hungry_jacks_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/pirap.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1991/files/61936810273.pdf
    • https://cdn.shopify.com/s/files/1/0434/1586/3447/files/85203198515.pdf
    • https://cdn.shopify.com/s/files/1/0433/5396/4712/files/charmeleon_silver_rg_movie.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/7674072830.pdf
    • https://cdn.shopify.com/s/files/1/0437/9462/8769/files/avira_2012_free_offline_installer.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/munov.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/dixaxesaw.pdf
    • https://cdn.shopify.com/s/files/1/0436/0100/2664/files/varivaroxusivajerumej.pdf
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/suxirus.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_off00006725.bin
2c37fe8163dd029d0387d92029f91094c5743da6241e72c7e4182d1d292821e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6725 5480 bytes
font_01_sfnt_off000079c6.bin
ab1382c71e88d9e98c69c2658a2596cabf07676161a93e81d3b1d44f33526650
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C6 9980 bytes