Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a01833b5446f74…

MALICIOUS

PDF

40.9 KB Created: 2020-08-01 21:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 203b8747dea333c5f61b33ce9333dfdb SHA-1: dad099c757338627c7ccb96976ac5afaec57891e SHA-256: 50a01833b5446f74b4da29c3e1b64eca6d12fa60c13acdc8c7bd5258cacc336f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which are hosted on Shopify domains and appear to be part of a link farm. One critical heuristic identified a link to a known malicious redirector at "https://ttraff.ru/pify?keyword=alabama+cdl+manual". The document body, though heavily obfuscated, contains this URL and references "Alabama cdl manual", suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious.

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=alabama+cdl+manual
    • http://files.oldcahaba.org/uploads/1/3/2/7/132740541/joleduxurolekel.pdf
    • http://files.southlandfamilyclub.com/uploads/1/3/1/3/131379371/e862cb.pdf
    • http://files.groundscapes.net/uploads/1/3/1/4/131453252/bimogafijis-kimow-fuxuwutewedelon.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/zifiguduzuwagufa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3124/files/opm_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/0749/2775/files/35682680741.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/wokodepusokapipojo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2016/files/12129183335.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/52012096738.pdf
    • https://cdn.shopify.com/s/files/1/0427/7692/0220/files/jimidoxewapevizejuwovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/26203998340.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/88364038458.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0021/files/66243367879.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/jivenikonijusovudalo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7269/files/dapikisuvepinemifotum.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/node_random_string.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_off000062f9.bin
e72f7a6ac101f6e577c2a01f88faeaf34215ae05c0c4663ca0f3f6a1c3733950
pdf-font-stream PDF embedded font (sfnt) at offset 0x62F9 4940 bytes
font_01_sfnt_off000073b3.bin
d21c782173c1127c865a875b1d1b5eb99c8dd9450fcb7a4843c1059cb8384be3
pdf-font-stream PDF embedded font (sfnt) at offset 0x73B3 10352 bytes