Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cf29cf37b3d966…

MALICIOUS

PDF

38.1 KB Created: 2020-08-09 11:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09a175a1372c45d30d301f809bb4fe58 SHA-1: d13902b6378d1ffe485863abbabe3b8251afa90f SHA-256: a9cf29cf37b3d9669eb7a214cbd172bea7121ef8bce628e896628f0a9b3775b3
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are also present in the list of extracted URLs. The primary attack pattern involves luring the user to click on these malicious links, likely leading to a further stage of infection.

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=architecture+residential+drafting+and+design+pdf
    • http://rometiw.bytcorp.org/uploads/1/3/0/7/130776485/fabuxopogevadil-rixatapiwu.pdf
    • http://files.fellowhumansclub.com/uploads/1/3/1/4/131484133/foxapad-zarenisikesutoj-moxodewunuma-zonobuvadelava.pdf
    • http://files.angelsandwine.com/uploads/1/3/0/7/130775432/mowakomorelonuwupon.pdf
    • https://cdn.shopify.com/s/files/1/0434/7746/7288/files/55428505842.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7589/files/interview_handling_skills.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/96653687230.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6650/files/98389501264.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4823/files/42704491717.pdf
    • https://cdn.shopify.com/s/files/1/0434/0924/4316/files/u_bahn_berlin_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3955/4727/files/nekaragokamavamapum.pdf
    • https://cdn.shopify.com/s/files/1/0432/1198/0964/files/97707509767.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bafewemuwidizisaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/4874/7676/files/dutepasexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/3476/2654/files/flow_cytometry_protocols_hawley.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/ledegajezafa.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_off000054a8.bin
187636dc752f680f75d23ce9701f833d187ece7577afdc3eef36ab9d9cd21fab
pdf-font-stream PDF embedded font (sfnt) at offset 0x54A8 5408 bytes
font_01_sfnt_off0000670a.bin
d995aa5ccc2fe68b5713161a7555f0f9aa32fdf314d8d7a01fe456332ba2dd6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x670A 10104 bytes