Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b2edaa34aafe85…

MALICIOUS

PDF

35.4 KB Created: 2020-08-23 05:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff16e664c7391fba18957505a10deeb SHA-1: 840b2ca573cb846cce393d3f8e45df96714e52af SHA-256: 85b2edaa34aafe856423706b67f090dd2b6121ed1795fe829cb60e125bf5e22e
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The embedded document body, though partially corrupted, contains a URL that is also flagged as a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, limiting the analysis of specific execution behaviors.

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=marella+clothing+size+guide
    • http://fusudomuf.clarioncountyato.org/uploads/1/3/2/6/132681670/xowululorero.pdf
    • http://files.friendsofhuggins.org/uploads/1/3/1/0/131070581/deperatonoru.pdf
    • http://muravotu.thestringninja.com/uploads/1/3/2/6/132681337/313617.pdf
    • https://cdn.shopify.com/s/files/1/0437/6759/5165/files/20033285758.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/89974530041.pdf
    • https://cdn.shopify.com/s/files/1/0454/4213/8262/files/android_studio_generate_apk_name.pdf
    • https://cdn.shopify.com/s/files/1/0434/7225/7181/files/26792790141.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1832/files/lavofopisonajinozikiguwed.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7775/files/what_are_personal_values.pdf
    • https://cdn.shopify.com/s/files/1/0437/0091/2278/files/megox.pdf
    • https://cdn.shopify.com/s/files/1/0434/4555/1271/files/80864904572.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_off000049ba.bin
73cf8b7d1d5e67edd01ec24f4eee1f8f3b13bfeb65587e6ad3f7f239e1434617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49BA 5256 bytes
font_01_sfnt_off00005b9a.bin
2508844bb4eeb6d93e8271607a623b047587e201b33f84758b1d2c9a75c92a9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9A 11684 bytes

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