Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ab2d6fde8fd4e1…

MALICIOUS

PDF

50.8 KB Created: 2020-08-20 01:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ac005a51cc1178ff8eec908ab751bb3 SHA-1: 18e54948b8cecd8a61f86cfec001754826e2d234 SHA-256: b8ab2d6fde8fd4e17579fee15fe244fade1f3d1c1958301482072c088bcf56dc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a mass of external links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text referencing 'factsheet of hdfc mutual fund' and the malicious URL. This suggests a phishing or scam attempt to redirect users to malicious content.

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=factsheet+of+hdfc+mutual+fund
    • http://rawudisux.augustushoffman.com/uploads/1/3/0/8/130814328/kapufu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7053/5318/files/nce_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/6232/1567/files/juterol.pdf
    • https://cdn.shopify.com/s/files/1/0429/3630/3782/files/96459735225.pdf
    • https://cdn.shopify.com/s/files/1/0462/2899/6247/files/tumblr_video_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/jarvis_health_assessment.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/chapter_10_review_states_of_matter.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/romiket.pdf
    • https://cdn.shopify.com/s/files/1/0444/3049/1815/files/algorithm_computer_programming.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5947/files/xijuvis.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/69682797110.pdf
    • https://cdn.shopify.com/s/files/1/0432/5762/6792/files/48011303206.pdf
    • https://cdn.shopify.com/s/files/1/0432/1529/0529/files/antihistaminique_et_grossesse.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/
    • https://cdn.shopify.com/s/files/1

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c8b.bin
42ca9355f6d700d8f0942a5251ad1574d067c655092d2335da80f9a02d536479
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8B 5120 bytes
font_01_sfnt_off00008dd6.bin
fa4c6d1bdb3f5d99ac6828ca189018fb55ac7c99c538aa32a08d63af7d7a6c2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD6 15648 bytes