Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff1fe1e3e90bb99…

MALICIOUS

PDF

52.5 KB Created: 2020-08-31 21:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2529fcd98d527f0700e40ef1688b989c SHA-1: f254e7d245db1951d6249a361e2aad85fd32366f SHA-256: fff1fe1e3e90bb99eae6524c9a974250fc1753179f7357e2a78d611f84dbb865
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=fiora+aram+guide'. Additionally, it exhibits a PDF link farm heuristic, with many links hosted on 'cdn.shopify.com', suggesting an attempt to disguise malicious activity. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the phishing or malware delivery intent.

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.cc/wix?keyword=fiora+aram+guide
    • https://cdn.shopify.com/s/files/1/0431/1311/9905/files/nibofatoliju.pdf
    • https://cdn.shopify.com/s/files/1/0431/8534/0580/files/30660488763.pdf
    • https://cdn.shopify.com/s/files/1/0429/9427/0371/files/breathing_exercise_for_stress.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5265/files/58179301548.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/rectification_column.pdf
    • https://cdn.shopify.com/s/files/1/0432/3734/3387/files/49614489543.pdf
    • https://static.usrfiles.com/ugd/76156b_03e6757f122142febc925645f120dbf5.pdf
    • https://static.usrfiles.com/ugd/529dbf_0a1efb25d4a743849a7ed605fdc3d865.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_76c4ca5d15fa4b74aaacc71a89b2f4bf.pdf
    • https://static.usrfiles.com/ugd/6240f8_76cb5a8278b14bf7ace4f7546167a14c.pdf
    • https://static.usrfiles.com/ugd/934fc3_9d8e4e29fb1b4974900e4de0f898c99a.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/beroromeligukonejukur.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/34577744406.pdf
    • https://cdn.shopify.com/s/files/1/0431/4395/4594/files/99894059544.pdf
    • https://cdn.shopify.com/s/files/1/0437/0864/5541/files/90018494916.pdf
    • https://cdn.shopify.com/s/files/1/0447/9251/2678/files/accouchement_dystocique.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_off00008369.bin
a10b2a1ee7b5a592d09f2d6e18d002e280f019818603854e3783dc6ccfcf592a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8369 4888 bytes
font_01_sfnt_off000093f2.bin
32e17c48c6e245dc399fa4696baf36f3bd2fabb5070a7d81ad775163d9aec34e
pdf-font-stream PDF embedded font (sfnt) at offset 0x93F2 16160 bytes