Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1cfebfe51e1745…

MALICIOUS

PDF

51.6 KB Created: 2020-09-13 06:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8e47522b8fdd39b7e305506c7c00533 SHA-1: 80090fad9c5f17355a9a608f44590fbc43c4ff54 SHA-256: fc1cfebfe51e1745a0ebb8230961afb32c562b84101677bb76db2e12fde9ae60
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector disguised as a Google Azure SSO login, which is a common phishing lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the embedded malicious link is the primary indicator of compromise.

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.link/pify?keyword=google+azure+sso
    • http://files.centralbaptistyorktown.org/uploads/1/3/2/7/132740256/1099261.pdf
    • http://kekanovam.talkinghardwood.com/uploads/1/3/1/0/131070389/tuvusokeganari.pdf
    • http://files.venturesxmeech.net/uploads/1/3/1/3/131383823/9319968.pdf
    • http://files.nailsbytdangshop.com/uploads/1/3/2/6/132696109/ruvejudipoxopegirif.pdf
    • http://files.waterloohouseporcelain.com/uploads/1/3/0/7/130740178/robuxibogimememif.pdf
    • https://static.usrfiles.com/ugd/97aff7_9f98b506f11b4d9080f11ab0c2ffd476.pdf
    • https://static.usrfiles.com/ugd/7182f3_22eb088bb9ac4a4090fb39be21bae734.pdf
    • https://static.usrfiles.com/ugd/c88839_4e754e7721e3420f9bd7bf22719112e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_9da6157660044a06930c73ded686fa4e.pdf
    • https://cdn.shopify.com/s/files/1/0436/9465/3594/files/88664706488.pdf
    • https://cdn.shopify.com/s/files/1/0435/7488/6563/files/sheet_metal_thickness_mm_gauge_chart.pdf
    • https://static.usrfiles.com/ugd/8c0e65_3fb3d03a28854e949abac522b6525827.pdf
    • https://static.usrfiles.com/ugd/b98abb_acd75a136cae4182bc3a7b64dd29cf06.pdf
    • https://static.usrfiles.com/ugd/0c4177_5987da10c9b44dbb9cb3a6f093978505.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_off00008d44.bin
b1a83a6c15b36697dc9865761cdfa67e7fbad2cad814adb22515602099b49a2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D44 4936 bytes
font_01_sfnt_off00009e26.bin
f49eb4e2c084b6513273c21631ed32695d2362edaf7d9fcaca30853aff5c3aa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E26 10428 bytes