Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c5e15bb66f5b4c…

MALICIOUS

PDF

43.1 KB Created: 2020-08-19 02:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9bdb5d5bc394a5d0543462ebc438fbf SHA-1: 85bf5b0692694994b41d21e63a3670faca584e17 SHA-256: 43c5e15bb66f5b4c677e0b70e368d63e90c86574c533c4ae7793c4994e58e2e4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=chithi+na+koi+sandesh+free+video'. Additionally, it features a PDF link farm, with many links pointing to Shopify-hosted PDFs, suggesting an attempt to obscure the malicious destination or to appear as a legitimate content aggregator. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the redirector and link farm indicates a likely phishing or malware distribution attempt.

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=chithi+na+koi+sandesh+free+video
    • http://files.reimagineec.com/uploads/1/3/0/7/130739211/766161.pdf
    • http://files.janeshannonphotography.com/uploads/1/3/1/3/131383544/1916874.pdf
    • http://files.calhouncounty911.org/uploads/1/3/0/7/130738949/xovaxawefinazu-nebemizex.pdf
    • http://files.galleryaesthetics.com/uploads/1/3/1/0/131069899/kelapigig-fesugopi-dewarisazoloda-jejuser.pdf
    • http://files.garypermenter.org/uploads/1/3/1/6/131606670/vupizisobok_xobag.pdf
    • https://cdn.shopify.com/s/files/1/0429/6612/2662/files/control_system_design_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/7820/6111/files/mujuvimobejolam.pdf
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/14975488767.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/zujulikuwi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4351/8629/files/74695372441.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/44562529978.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xarapidarobumebavo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3988/2402/files/nefapelakizowanutitafojov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2043/files/witukuvur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0329/files/11th_bio_botany_practical_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/aditya_hridayam_stotram.pdf
    • https://cdn.shopify.com/s/files/1/0440/8282/3320/files/lowes_willoughby_ohio.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_off0000569e.bin
e485098da6b1eec72f1416410c9d357528ffd9c73eb0668b29111492bba22309		 pdf-font-stream PDF embedded font (sfnt) at offset 0x569E 4992 bytes
font_01_sfnt_off00006789.bin
45c4aa7ce6c88f43acbde177affb8710241a61f55bb4ca77b1dad92cdf7040b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6789 12436 bytes
font_02_sfnt_off00008fce.bin
ab9aaf38e65b26a63b4bddcd42b8409a339c2a03f0f8c61fe6c5aa47988e2c2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCE 3984 bytes

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