Malicious PDF — malware analysis report

Static analysis result for SHA-256 44008de116a4779c…

MALICIOUS

PDF

50.6 KB Created: 2020-08-04 07:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce2f80ea6e1e0af7007498114b76e28a SHA-1: 05c54e2999e152d15e036424f1fc95a8b1ca69e8 SHA-256: 44008de116a4779cd2e454dd7a37d3a816a5a2f521586da27f5b99beed65a447
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free course download, which is a common social engineering tactic. The ML classifier strongly indicated maliciousness, and the PDF structure includes a mass external link farm, suggesting an attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes. No scripts were extracted, limiting the analysis of direct execution vectors.

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=english+speaking+course+free+download+pdf+in+gujarati
    • http://files.mlabnj.com/uploads/1/3/2/7/132740214/fisativ.pdf
    • http://files.dunlapfire.com/uploads/1/3/0/7/130775046/1545000.pdf
    • http://files.chesterknits.com/uploads/1/3/0/7/130740538/4055390.pdf
    • http://files.wickedlashdesign.com/uploads/1/3/0/8/130874587/gupamugonup.pdf
    • https://cdn.shopify.com/s/files/1/0437/4672/1946/files/99914212186.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/trails_of_cold_steel_ap_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/66698485210.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78394199391.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/38694294969.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/speed_air_compressor.pdf
    • https://cdn.shopify.com/s/files/1/0447/2619/0234/files/cydia_ios_8._1._3.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6967/files/49552514667.pdf
    • https://cdn.shopify.com/s/files/1/0431/5987/9834/files/75385942637.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/40722007248.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/42824267767.pdf
    • https://cdn.shopify.com/s/files/1/0432/3105/1943/files/48005501140.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c57.bin
cf97bbb46d0090a4581c4897d353154711c31248ca8d05ce33b09060545ae9aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C57 5604 bytes
font_01_sfnt_off00007f79.bin
87016e8933cc862d1d188edfbee698abcff8178ed3d6b510b61737ee02f60284		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F79 4336 bytes
font_02_sfnt_off00008d1a.bin
9df88f3907fe0d0c43643cbc73c468363c614bdd8de1d1f573b62fed124bc529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1A 15260 bytes

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