Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c0c87dee254feb…

MALICIOUS

PDF

53.3 KB Created: 2020-08-09 11:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d64928d919eb868529bdeb0e29ed966b SHA-1: b5d630026acf2f7ed7188263c177dcd558a07a2e SHA-256: 43c0c87dee254febc9adffd40e341d204486b602d811341a6c4f431fb1c67dc4
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to legal acts and the wkhtmltopdf tool, suggesting a lure to disguise malicious links. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood 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/pify?keyword=scheduled+caste+and+scheduled+tribe+prevention+of+atrocities+act+pdf
    • http://files.wildernessrundachshund.com/uploads/1/3/0/8/130873795/3823515.pdf
    • http://vovaruw.wakefieldpodiatrists.co.uk/uploads/1/3/1/6/131607163/novope-viwapelajajiti-xekuleleniwabi.pdf
    • http://files.urbanthreadla.com/uploads/1/3/2/8/132815008/filalegukaz_mimija_sabibin_rabuvig.pdf
    • http://files.fishonjigsnorthwest.com/uploads/1/3/1/4/131454549/lasuz.pdf
    • http://tomax.miwoori.net/uploads/1/3/1/3/131383483/vofonanuxi_narimawe_vuludowata.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lavatorumagenikezelun.pdf
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/gesimuturuzide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76102764406.pdf
    • https://cdn.shopify.com/s/files/1/0428/9875/1641/files/aws_training.pdf
    • https://cdn.shopify.com/s/files/1/0433/8148/9813/files/devira_tamil_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/5982/1209/files/13344713609.pdf
    • https://cdn.shopify.com/s/files/1/0430/2195/9325/files/29075408954.pdf
    • https://cdn.shopify.com/s/files/1/0435/6263/1326/files/15507536232.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/alto_sax_finger_chart.pdf
    • https://cdn.shopify.com/s/files/1/0435/9625/1304/files/climate_change_agriculture_and_food_security.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84312174386.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3945/files/15983848467.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zamujogeve.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_off00009157.bin
81471e54672d87de6f703773cb53401bd4012d16a70716ad121a215f74c0f85b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9157 5544 bytes
font_01_sfnt_off0000a429.bin
e01b36890ce6e13e207968820cd33ded5d25a727cddb15850da16761440b0ad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA429 10296 bytes

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