Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9fb79b3168ef82…

MALICIOUS

PDF

35.1 KB Created: 2020-08-23 19:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 220557de366390df7b155e81c6f7be16 SHA-1: aef63963b3333e711df9a0a8d1826b3dcb80f145 SHA-256: 6b9fb79b3168ef82b24626a5109bb52988feb6e190ef3efea32a53b36ac7d19c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic firings indicate a PDF link farm, suggesting the document's primary purpose is to distribute links to external sites, potentially for SEO manipulation or to lead users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=gray+blue+bed+sheets
    • http://files.centerhillchoir.com/uploads/1/3/1/4/131453084/zozubevarenedav.pdf
    • http://files.madisonswcd.org/uploads/1/3/1/0/131069890/fc9d6805.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7029/9048/files/awdhesh_premi_ka_bhojpuri_song_video.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bovabokuvuxinapuwukiberem.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/jikixi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8260/2913/files/importance_of_studying_biogeography.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/gibinufidovivusukiladun.pdf
    • https://cdn.shopify.com/s/files/1/0434/4555/1271/files/xifiwofufabijupofaxizut.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/laminar_flow_equipment.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/60176148164.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/mafijimo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2496/files/partnership_deed_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0438/6694/7744/files/aquella_orilla_nuestra_descargar.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004aa7.bin
6caa83cb7657b4ae0299e1eb11474a4b231316f867449e166946b8306bc01363
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA7 5188 bytes
font_01_sfnt_off00005c47.bin
691a10a59ee0a668e674fa2ec505cd948bc38aead90385c30b2122692a39c952
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C47 10508 bytes