Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e5e65f8adb2030…

MALICIOUS

PDF

42.7 KB Created: 2020-08-29 21:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1964c2a75564270d81142434d511b2a7 SHA-1: 79f978943961691c77374c8d746668ff4cbbfe0a SHA-256: 78e5e65f8adb203091695b549b90caedf66560351c4a8544a8dae27d474a7e8f
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 benign Shopify-hosted PDFs. However, one critical link redirects to known malicious infrastructure, suggesting a deceptive SEO tactic to drive traffic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of a malicious redirector is a high-confidence indicator of malicious intent.

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/wix?keyword=lenovo+g570+laptop
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/imo_file_location_in_android.pdf
    • https://cdn.shopify.com/s/files/1/0450/8103/4917/files/kapebowiro.pdf
    • https://cdn.shopify.com/s/files/1/0460/3189/6740/files/diwikekojukuwotixud.pdf
    • https://static.usrfiles.com/ugd/b8c837_b617370c43ad47229a90c2b3610463ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_de81def0044f4711a94fb8dd501c1da2.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d5f7a0aaf34f9e8a31f1af57986d26.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d6b61e60e3f448f8a4c378df59dd932.pdf
    • https://static.usrfiles.com/ugd/f1780b_3a2a595ba4974aa3a024765559866c11.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3496/files/rational_expressions_and_equations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/93920839785.pdf
    • https://cdn.shopify.com/s/files/1/0435/3979/2021/files/canada_drinking_water_quality_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/36903624488.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/12679231090.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/tidatif.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/peter_benchley_beast.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_off000061c8.bin
817aa4bba51d83e85f17f35d42fcffae3769267dffd9440a2e30af10af7de1f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x61C8 5060 bytes
font_01_sfnt_off00007337.bin
1d92e1c8501aa59b1fe0fb6e13d3b819f2025e082823843fe0f7df0a9df7e5b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7337 13460 bytes