Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad88c59d667b68e7…

MALICIOUS

PDF

46.2 KB Created: 2020-08-06 20:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2409ed40fe72a5f440fe7a691f3fadc1 SHA-1: 5dda5a8545e626d65c50496c7703e2bd7216d5c7 SHA-256: ad88c59d667b68e735dec2f9af8b2dba6c8738222a610359daeeb7658c1dd4ee
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a document about the history of banking in Nigeria. The PDF also hosts a large number of external links, many pointing to Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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=history+of+banking+system+in+nigeria+pdf
    • http://files.flowersbyroseus.com/uploads/1/3/1/3/131381712/xunomifimi.pdf
    • http://files.storiestoldbyholly.com/uploads/1/3/0/7/130776861/7527626.pdf
    • http://sulejuw.chicagoshares.org/uploads/1/3/0/7/130776728/6814567.pdf
    • http://files.moneyforpropertydamage.com/uploads/1/3/2/6/132683330/8489864c9ce4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66689816557.pdf
    • https://cdn.shopify.com/s/files/1/0429/6582/7747/files/clannad_visual_novel.pdf
    • https://cdn.shopify.com/s/files/1/0437/2178/5498/files/bomavewobagaxidabosibo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1082/files/51139673371.pdf
    • https://cdn.shopify.com/s/files/1/0434/5895/3369/files/vekufukugo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/pajevimumetusawudoputewul.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/lelemixorekalodix.pdf
    • https://cdn.shopify.com/s/files/1/0436/4809/0270/files/divmod_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11085861466.pdf
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/38984154009.pdf
    • https://cdn.shopify.com/s/files/1/0435/8098/1403/files/twilight_graphic_novel.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_off00007618.bin
cb4e4da172af79aa9bdb5ad9eee6c5797240e8c57e4c3acab71883a2e3e56409
pdf-font-stream PDF embedded font (sfnt) at offset 0x7618 5596 bytes
font_01_sfnt_off00008911.bin
8d8c6dae1dfaae43b2804e6f90963c90b3ac9309add02f2f0ac05c3073867607
pdf-font-stream PDF embedded font (sfnt) at offset 0x8911 10024 bytes