Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ab8f30b2cadcaa…

MALICIOUS

PDF

56.5 KB Created: 2020-08-12 03:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db5a3ffe4aa58e7e04de78cd3853a3ca SHA-1: f3d5898730a361c8190647c1496c660d110e8ba3 SHA-256: 98ab8f30b2cadcaa09fb2e450da8d319f2427bfa0a53b2474ff6835356e1b2b9
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=barron+s+sat+2020+pdf'. Another critical heuristic indicates a PDF link farm, with 'https://cdn.shopify.com/s/files/1/0431/7793/5004/files/dd_wrt_r7000.pdf' being the first identified URL. The ML classifier strongly flags this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL is sufficient evidence for the attack pattern.

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=barron+s+sat+2020+pdf
    • http://files.myownbodywork.net/uploads/1/3/0/7/130739258/6071222.pdf
    • http://bivisibap.dobiedomain.com/uploads/1/3/1/6/131606289/luxowulusulud.pdf
    • http://files.fogalongthecoast.com/uploads/1/3/0/7/130776245/7fbe350.pdf
    • http://files.shoesheartart.com/uploads/1/3/1/4/131436980/lukotewigofojaj-sodafulatezora-gezuxamuvagife.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/dd_wrt_r7000.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/38550623617.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6218/files/18471295860.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/kifuzudatafegemi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/korepatebejoxoxodajedi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7175/files/87460006643.pdf
    • https://cdn.shopify.com/s/files/1/0439/0558/1211/files/black_seed_oil_health_benefits.pdf
    • https://cdn.shopify.com/s/files/1/0430/6590/1210/files/juruvowurevudadep.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/pivelofoganekapuda.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1000/files/gatoro.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_off00009fad.bin
7c00ce25cc3d9df5efa3b70c347a50ce5da6377702a768df8a5103df71cde7ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FAD 5328 bytes
font_01_sfnt_off0000b1d0.bin
94f7e2d0e626362103b7fd96f1eaa9225ae33dbc9e421ff264f24890f70e130b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D0 10300 bytes