Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c9c6374368e051…

MALICIOUS

PDF

45.0 KB Created: 2020-08-31 02:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ec9a92f63013e3d4ff336d6149dd4f9 SHA-1: f9e66c2b587d89a8172c8e618159cccc156c9095 SHA-256: 70c9c6374368e0517581f88fcd6617640683f00b63212648589ba7159892adf3
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector infrastructure at ttraff.com. The document body, though heavily obfuscated, contains text that appears to be a lure for "theoretical probability worksheets 7", likely to trick users into clicking the malicious link. The PDF also contains a large number of external links, many pointing to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning 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.com/wix?keyword=theoretical+probability+worksheets+7
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/581871399.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/bolafezemiwijevasufuluk.pdf
    • https://cdn.shopify.com/s/files/1/0437/5946/8701/files/zixowadepopa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6378/8188/files/3193912445.pdf
    • https://cdn.shopify.com/s/files/1/0439/0020/7272/files/52368374470.pdf
    • https://cdn.shopify.com/s/files/1/0459/9906/3199/files/wages_board_ordinance_sinhala.pdf
    • https://cdn.shopify.com/s/files/1/0437/3276/2785/files/94765206763.pdf
    • https://static.usrfiles.com/ugd/b42fd6_97716014fca54c0abbfbcfda2341500d.pdf
    • https://static.usrfiles.com/ugd/b8c837_4947f2c62b194e33afa7c93d8e621d0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffb888ccdff74888b90bfa85a1dd202f.pdf
    • https://static.usrfiles.com/ugd/20d83a_0734ceb1e17740c1bcc10ad91e836f07.pdf
    • https://static.usrfiles.com/ugd/ace02d_ff558f47391245fda521a90960c96eda.pdf
    • https://static.usrfiles.com/ugd/cf14a4_b922b59760be4c57b3390c845e9e76a0.pdf
    • https://static.usrfiles.com/ugd/4c1554_99ebd2840b00453ba79516310a503437.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_off000070c4.bin
42ce33205e63dca1e728ad9ce88648539a80e95ace67cd243467db60830b648d
pdf-font-stream PDF embedded font (sfnt) at offset 0x70C4 5448 bytes
font_01_sfnt_off0000835e.bin
5ae4ac01893bdac965fa2d73a6e6f04ad56d8bd0e458a678bbf8ebc7316f4407
pdf-font-stream PDF embedded font (sfnt) at offset 0x835E 10428 bytes