Malicious PDF — malware analysis report

Static analysis result for SHA-256 306b11e5c3dc0861…

MALICIOUS

PDF

50.2 KB Created: 2020-08-15 06:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1e13ad07df0bc70290138d91c23aced SHA-1: 8966bb3b6bfbd99d1d30d19f893b9be13a5a2bf1 SHA-256: 306b11e5c3dc08613254c821c44030424b3437b9d1a56c63949611bfd625c0a9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=bond+polarity+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. These indicators suggest the primary purpose is to redirect users to malicious infrastructure.

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.com/pify?keyword=bond+polarity+pdf
    • http://files.masteringenglishtoday.com/uploads/1/3/1/8/131871677/mexoladibekupuvaxuz.pdf
    • http://files.markel-products.com/uploads/1/3/1/3/131381675/fidiva.pdf
    • http://files.lindagreenup.com/uploads/1/3/1/3/131382030/8186524.pdf
    • http://kuvigadub.obxelectricians.com/uploads/1/3/2/6/132680903/kinasu.pdf
    • http://files.mentorsforwomen.com/uploads/1/3/0/9/130969748/1714462.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/bosezofu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/22855708132.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/piwibigaposapuxun.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8133/files/nginx_permission_denied.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/9798564711.pdf
    • https://cdn.shopify.com/s/files/1/0433/6402/4479/files/valobojutizazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/corporate_brochure_template.pdf
    • https://cdn.shopify.com/s/files/1/0448/2993/3725/files/nowidawava.pdf
    • https://cdn.shopify.com/s/files/1/0434/6963/5734/files/solonalan.pdf
    • https://cdn.shopify.com/s/files/1/0429/8201/5135/files/5329631878.pdf
    • https://cdn.shopify.com/s/files/1/0430/1222/7225/files/38325407182.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_off000085af.bin
365510c9d46b9ddcc670a562f506270c59004826c0765425c7dbfbc2055c90ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x85AF 5008 bytes
font_01_sfnt_off000096cf.bin
b996e216ec59fcde0c886d7fbd23cc86d0bc946c6710a73240183fa1886a7f7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x96CF 10828 bytes