Malicious PDF — malware analysis report

Static analysis result for SHA-256 4443727a3a61d708…

MALICIOUS

PDF

40.4 KB Created: 2020-08-05 15:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 392c7450d5b1240bbae035259b14db92 SHA-1: 6c70d9f8df04989f25e6adbca8011cb402a0c878 SHA-256: 4443727a3a61d7081a31805b3c24610e53ca0abf0edcfcdd5aa7600c3ed0c3c3
152 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, directing users to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users to a malicious redirector.

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=bromination+of+phenol+pdf
    • http://files.projectindianbeauty.com/uploads/1/3/0/8/130874122/bubaserikumazo.pdf
    • http://files.ayrcc.org/uploads/1/3/2/7/132710779/zolepas_muparewop_zajijugope_nasefaxiw.pdf
    • http://files.baileybloomco.com/uploads/1/3/0/7/130775760/7630999.pdf
    • http://files.mathsict.shenfieldlearning.com/uploads/1/3/0/9/130969704/mizumimugumoxu-xisuzapotej-tikek.pdf
    • http://files.chungdongfmc.com/uploads/1/3/0/7/130740138/dewizen_ridoga.pdf
    • https://cdn.shopify.com/s/files/1/0427/8904/4383/files/dazudane.pdf
    • https://cdn.shopify.com/s/files/1/0437/5068/6874/files/55553420354.pdf
    • https://cdn.shopify.com/s/files/1/0440/4586/1014/files/puxoposajavosozinuda.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5317/files/fotatajejoniz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/xabuxiwatuxijawinukapol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/kozusofirexiripimoje.pdf
    • https://cdn.shopify.com/s/files/1/0440/3727/5813/files/lawepanumed.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9448/files/movibutezujukufadedul.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5531/files/baleno_rs_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0434/5724/9430/files/77427357989.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/wilatazawozitakoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7327/2998/files/63181558936.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/87003879046.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2006/files/steamer_lane_cam.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_off000062b6.bin
d8dce1ef9bdb52fa2c8b70d69925cdbab04e76ddc6448fc54c2e874dcea35411		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B6 5152 bytes
font_01_sfnt_off0000740a.bin
4fc5f612e823918be8239e7168c7f9ccaa2119f0b424e53d5bf2f6089851e8f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x740A 9408 bytes

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