Malicious PDF — malware analysis report

Static analysis result for SHA-256 035ebc07a0acf35b…

MALICIOUS

PDF

39.7 KB Created: 2020-08-31 11:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41996cfcf0162f475757ef0dcea8f91d SHA-1: a889fb954f3370891904da9e7b5e6e23992b0a27 SHA-256: 035ebc07a0acf35bfc580af2b0287e9b1e8d31a22e46d5309996077f5308aa60
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. It also exhibits characteristics of a PDF SEO link farm, embedding a large number of external links, with the primary malicious URL being a redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise its true purpose.

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.me/wix?keyword=tara+grinstead+remains+found
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1524/1891/files/general_sociology_with_anthropology_and_family_planning.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/dimuzawonepuximisegubes.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/18575348720.pdf
    • https://cdn.shopify.com/s/files/1/0431/2373/6738/files/vixixibubarivavupin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/kipatevomux.pdf
    • https://cdn.shopify.com/s/files/1/0436/6126/3001/files/jailbreak_ios_5._1_1.pdf
    • https://cdn.shopify.com/s/files/1/0435/5883/0229/files/nowax.pdf
    • https://cdn.shopify.com/s/files/1/0431/4018/6279/files/amazon_aws_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5906/files/english_grammar_tenses_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0439/4693/4430/files/bu_college_admission_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/tojazanitetogategef.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/78035618563.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_off00005e03.bin
35570d2480df876ed22f92cdd3363246e8705c9bdd530dd80b5f8d54a64297f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E03 5144 bytes
font_01_sfnt_off00006f6a.bin
e9c34b4f1e913c5a985c2ef47bbd203338b97a30850bd0666b6741f1e3769404
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6A 10280 bytes