Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a29bc9780ab502b…

MALICIOUS

PDF

41.5 KB Created: 2020-08-21 12:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5e1b2651cdd207f41c26a8ebdaece97 SHA-1: fffb76b2268aff67a5d67c6f360861b94f0cba95 SHA-256: 3a29bc9780ab502bd4a3b84bc461f9a8193069a3bc37c7a2a83f9519ecfa32db
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to 'https://ttraff.cc/pify?keyword=linga+bhairavi+yantra+guidelines'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which are benign PDFs hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body contains obfuscated text and the malicious URL, suggesting an attempt to disguise the 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/pify?keyword=linga+bhairavi+yantra+guidelines
    • http://files.jon-thompson.com/uploads/1/3/0/7/130739032/0571bf662f481.pdf
    • https://cdn.shopify.com/s/files/1/0437/5642/1278/files/mechanic_shop_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0435/8848/5288/files/border_around_bootstrap_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/3939/0872/files/character_is_destiny_john_mccain.pdf
    • https://cdn.shopify.com/s/files/1/0429/8555/4073/files/poxabukizifebuluw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/rubekebemowuweta.pdf
    • https://cdn.shopify.com/s/files/1/0434/6898/0377/files/tafenusebosanatosutu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/20421739319.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9452/files/senidexubajibolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3574/files/brigham_city_movie.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/cae_exam_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kikurum.pdf
    • https://cdn.shopify.com/s/files/1/0432/3157/6231/files/atm_full_form_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/norozin.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000641c.bin
b0ed32b6765cebbfb03e6f032804630064440dddaa77ca9ce2cd3d75b980f470
pdf-font-stream PDF embedded font (sfnt) at offset 0x641C 5332 bytes
font_01_sfnt_off00007639.bin
763c1f9c019bbad77a54594cc4b9bab166d05dbd7abc7c8180acb8947cf795a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7639 10236 bytes