Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e1557d08a0339e…

MALICIOUS

PDF

51.8 KB Created: 2020-08-03 14:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e795137cc78d9ab1ef424dd65ed1a85e SHA-1: f9ea9447e29589b1541e4a631e1b6edfc88913f8 SHA-256: 77e1557d08a0339eb049e8a5fa0fd2e9f3d17f3bf5dd3a595f92c8553f0613d6
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL and numerous other links, many pointing to Shopify domains, suggesting a link farm or redirection strategy. The ML classifier strongly indicated maliciousness. The primary attack pattern involves luring the user to a malicious site via a deceptive link within the PDF.

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=familia+bacillaceae+pdf
    • http://files.robertdidonato.com/uploads/1/3/1/3/131380029/fuvonefesiwi.pdf
    • http://files.threeriversbigbookweekend.org/uploads/1/3/1/4/131454766/2281761.pdf
    • http://files.memberoftwotribes.com/uploads/1/3/0/9/130969354/3149569.pdf
    • https://cdn.shopify.com/s/files/1/0436/2957/6352/files/ds2_petrified_egg.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/blender_select_face.pdf
    • https://cdn.shopify.com/s/files/1/0437/7752/3861/files/tubizo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5321/2060/files/nuxajumesamojaw.pdf
    • https://cdn.shopify.com/s/files/1/0439/7580/3038/files/nomafof.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7534/files/tekosatimumerit.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/subnautica_charge_batteries.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/44143233945.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2591/files/runescape_family_crest.pdf
    • https://cdn.shopify.com/s/files/1/0437/3767/7985/files/76734834192.pdf
    • https://cdn.shopify.com/s/files/1/0432/3183/8368/files/mibunemamesuvagibaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/52298556853.pdf
    • https://cdn.shopify.com/s/files/1/0429/2716/1507/files/7187322700.pdf
    • https://cdn.shopify.com/s/files/1/0437/6163/1389/files/silupuxosolukafevodu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/69285813592.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_off0000827a.bin
34904ed5c778635ce10c0cc0773839f76c527f459c1d44886567d35a577143d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x827A 5124 bytes
font_01_sfnt_off000093d8.bin
c870a4b44ef33a856713635ddbd4d651f33a931e36a5e246699585b2963f5290		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93D8 14988 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.