Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a705a2ae5e08b24…

MALICIOUS

PDF

37.8 KB Created: 2020-08-08 23:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7d66ad54fd2ac3ced6a2906838c6c88 SHA-1: 172962d267edd6e9fbc9c7cfc5c2bcc42a66656e SHA-256: 0a705a2ae5e08b244db533bb624bc3fc01da48937073705c6a5b9a830152f469
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, https://ttraff.com/pify?keyword=because+vs+because+of+exercise+pdf, is identified as a malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme designed to drive traffic to malicious infrastructure. No scripts were extracted, and the document body is heavily obfuscated.

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=because+vs+because+of+exercise+pdf
    • http://files.loraincountyohc.net/uploads/1/3/1/4/131454850/wisop.pdf
    • http://files.daishaenos.com/uploads/1/3/1/4/131407057/begarejekuxurat.pdf
    • http://files.linie-e.com/uploads/1/3/1/8/131857115/ba379ff5f593a.pdf
    • http://files.abortion-decriminalisation.org/uploads/1/3/1/3/131380612/4258888.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/75419184183.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/45331780657.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/lenineviledos.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3967/files/algebraic_expressions_and_equations_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6345/files/biblia_septuaginta.pdf
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/10107640866.pdf
    • https://cdn.shopify.com/s/files/1/0429/2666/9987/files/57038671904.pdf
    • https://cdn.shopify.com/s/files/1/0431/9808/7328/files/how_to_install_tekkit.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/87014550098.pdf
    • https://cdn.shopify.com/s/files/1/0428/5772/6118/files/54314847090.pdf
    • https://cdn.shopify.com/s/files/1/0429/0281/4876/files/dulova.pdf
    • https://cdn.shopify.com/s/files/1/0441/4016/7320/files/pgcc_chemistry_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/4843/5861/files/zoxozegejusi.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_off0000535b.bin
4c48c1b352162a9c96bf967cf94f2436c80887508469e94b623c8bd9eb6ed741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x535B 5436 bytes
font_01_sfnt_off000065ed.bin
8c469eaa15ea1e008785da9234ad022f7922c8e30801394117274283aa8f5602		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65ED 10668 bytes

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