Malicious PDF — malware analysis report

Static analysis result for SHA-256 635d537a9baa4a64…

MALICIOUS

PDF

44.5 KB Created: 2020-08-13 21:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 790c3ce7bdab70456acbc982029583b2 SHA-1: 44f60acb1b98329f11472bbbd0bfd39b7697f987 SHA-256: 635d537a9baa4a64e1111aa83575113d1b899e75d94373198242f7297d1fb239
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to benign Shopify URLs, but one critical link redirects to known malicious infrastructure via ttraff.com. The document body, though heavily obfuscated, contains the text 'Abs workout program pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness, and the presence of a redirector link is a high-confidence indicator of malicious intent.

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=abs+workout+program+pdf
    • http://files.hooksflyinghranch.com/uploads/1/3/1/4/131437627/dibariv.pdf
    • http://files.ourlordstemple.org/uploads/1/3/1/6/131606416/guxobov.pdf
    • http://files.libertyrecbc.com/uploads/1/3/1/1/131163512/3865817.pdf
    • http://mabuvugov.tayloredtoyouevents.com/uploads/1/3/0/9/130969153/bapigetulipupet-rugukivov-fawafojidal-renanojemutora.pdf
    • http://files.coastlinepainting-nc.com/uploads/1/3/1/4/131438557/3600059.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/0182/8760/files/litenipomezabepadoboleli.pdf
    • https://cdn.shopify.com/s/files/1/0427/8448/9631/files/27825095943.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/working_principle_of_digital_oscilloscope.pdf
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/olympian_generator_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4048/9122/files/76754545528.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24863128440.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/85546567720.pdf
    • https://cdn.shopify.com/s/files/1/0433/3846/5435/files/factorio_3_lane_balancer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66048758492.pdf
    • https://cdn.shopify.com/s/files/1/0433/6100/9818/files/bm_sharma_pdf_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0763/0747/files/82363911333.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3398/files/sirup_belimbing_wuluh.pdf
    • https://cdn.shopify.com/s/files/1/0439/1629/6360/files/principles_of_economics_asarta_butters.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_off00006c66.bin
4ecef171d755dd8a8eb75ebfc333eb8c6c2e7513e3672cce5589f305053d14a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C66 5612 bytes
font_01_sfnt_off00007f7c.bin
1d9a6587697d5cd17494223c8b3dd777d868fc0566004e320947e13563895f1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7C 10672 bytes

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