Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc968e20cd243d3…

MALICIOUS

PDF

78.8 KB Created: 2020-08-19 07:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfc8eb1832d9ec4230c5837e80e70559 SHA-1: 98c934c28d60809f2900bbf468f102fc018406e6 SHA-256: fdc968e20cd243d3d1c6b2d416267cfdcaf0c2a3076f5778708b933f063c82d3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link directs to a known malicious redirector at ttraff.ru. This indicates a phishing or malicious redirection attempt, likely to deliver a secondary payload or lead the user to a fraudulent site. 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.ru/pify?keyword=chloroform+meaning+in+chemistry
    • http://files.budgetmodelrailways.co.uk/uploads/1/3/1/4/131437074/987afc164675.pdf
    • http://files.cosmexmelbourne.com/uploads/1/3/1/4/131483491/7508292.pdf
    • http://files.sdsuengineers.com/uploads/1/3/1/4/131407144/figobimusoletep_kepokuxu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1269/2895/files/qaqc_mqnuql_for_construction.pdf
    • https://cdn.shopify.com/s/files/1/0433/7818/0257/files/chandra_grahan_2018_video.pdf
    • https://cdn.shopify.com/s/files/1/0428/5811/9334/files/meguninapi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9851/4343/files/ashab_e_kahf_story_in_urdu_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/9294/9658/files/loop_antenna_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/lumamenevo.pdf
    • https://cdn.shopify.com/s/files/1/0439/1239/6968/files/19030710525.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/49251882343.pdf
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/31506514966.pdf
    • https://cdn.shopify.com/s/files/1/0436/5480/7717/files/vukafuraxufawodaguv.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/sofabewijelomotasaliwosi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9898/6909/files/72198907614.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_off0000d8a3.bin
b9c1bd2281f23f09d905494077011cda678d8ff8a20e62f41a46584ce81a564d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 6492 bytes
font_01_sfnt_off0000e8d8.bin
551de0816c0c8625fdf596f7dd20a9a484f17538f7c7d9809a42a6a8cf47c9ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 5300 bytes
font_02_sfnt_off0000fac0.bin
b20bd9bc7cb94dbc7f10b14f1ae2f66198ab18ef281a98fb08899ebd24f263c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 15624 bytes

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