Malicious PDF — malware analysis report

Static analysis result for SHA-256 144cb483691c700a…

MALICIOUS

PDF

42.5 KB Created: 2020-08-22 08:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43289a1fe7d4dbe0b342776a97ebc621 SHA-1: c913a8a33a074c875fd67fc5dbf0804b560d44b7 SHA-256: 144cb483691c700ac76d49c543b175a86e0d95cfdec8fb6188b078869aa4071c
194 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to link farms and a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that suggests a lure related to "401k guidelines 2018", which is likely intended to trick the user into clicking the malicious links. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector suggests an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=401k+guidelines+2018
    • http://files.buildingdecarb.org/uploads/1/3/0/7/130775859/63ddbef4e41e3a7.pdf
    • http://files.relaxationretreathealthbenefits.com/uploads/1/3/1/8/131856539/5358974.pdf
    • http://bomawu.shannonbibby.com/uploads/1/3/2/8/132814930/64fef2e3.pdf
    • http://files.petersburgchurchofchrist.org/uploads/1/3/2/6/132695668/50abea4fd9ecab.pdf
    • http://files.antiquesg.com/uploads/1/3/2/7/132740424/bf8e42ff1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1809/9615/files/tunubogonoxunugexutod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalekubaserigudopen.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sabam.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/86421529557.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9021/files/40683671242.pdf
    • https://cdn.shopify.com/s/files/1/0431/8501/2900/files/2015_cadillac_cts_v_sport_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/baldi_s_basics_apk_mod_menu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5127/files/97418403572.pdf
    • https://cdn.shopify.com/s/files/1/0437/7716/3416/files/dilupasunidak.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_off00006819.bin
8c47967e5f83905a6a67229762b8c6f8b2efa9be8176c1e37459a1011279cf8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6819 5264 bytes
font_01_sfnt_off00007a1c.bin
90fbec5dd87d5e620c05832738dec222e578797a6a6ce76aa2eac6c9ad2e13d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1C 10452 bytes

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