Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c84da628796e33…

MALICIOUS

PDF

41.8 KB Created: 2020-08-14 05:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2869508b48b32479d2e00d8540f1732 SHA-1: 44c6ebd3409a318d2a77b9417b86a2f1dee1ed1d SHA-256: 18c84da628796e3300aa4bcdfcf21e37894b748d93a22ee562488ed87dc2afff
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on domains associated with link farms. One prominent link, disguised as an AWS certification PDF, redirects to a known malicious URL. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document body and malicious links.

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/wb?keyword=aws%20certified%20cloud%20practitioner%20exam%20pdf
    • http://duwudojod.heavyhittersftjackson.org/uploads/1/3/1/4/131407705/zavifadanuberiwa.pdf
    • http://redas.wsscaseattle.com/uploads/1/3/0/7/130775727/fojeni.pdf
    • http://files.megantroglio.net/uploads/1/3/1/6/131606397/vutemumojudun-juxuju-modurimir.pdf
    • http://jewopafuw.asding.org/uploads/1/3/1/4/131483025/wunajufemogigod-miwixe-lewaxasadanaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/sexevubemisewipijotubu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/lisiwukanor.pdf
    • https://cdn.shopify.com/s/files/1/0434/8284/1250/files/29922950606.pdf
    • https://cdn.shopify.com/s/files/1/0433/7847/5162/files/open_hosts_file.pdf
    • https://cdn.shopify.com/s/files/1/0429/4731/3827/files/xupazelofodidunevevug.pdf
    • https://cdn.shopify.com/s/files/1/0440/6840/5413/files/osha_emergency_action_plan.pdf
    • https://cdn.shopify.com/s/files/1/0429/0111/0940/files/difference_between_marketing_and_public_relations.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/77289078024.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/61909010408.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/biragapos.pdf
    • https://cdn.shopify.com/s/files/1/0440/1935/1710/files/26408045851.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2508/files/57120734948.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_off000062e3.bin
b6bf6e382605dba9b405101bbc258a673a413591cf4ca14e7d1a05bb8c5887a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E3 5448 bytes
font_01_sfnt_off00007562.bin
5f04fc40121f03b3e3b83b4c3ce0114329ce1c968aaa283cbe29ce64db062ba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7562 10844 bytes

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