Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa358e444456a171…

MALICIOUS

PDF

41.7 KB Created: 2020-08-13 05:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceaad85115218599ce737a93e7ec454f SHA-1: 34702a0b23ce0a05e6a9ba61273dba17936e62a4 SHA-256: aa358e444456a171db3bcd3a83809104e2ba7db0fa49b542e63292e3ee939574
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The primary attack pattern appears to be a link farm designed to distribute malicious content or phish users.

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/pify?keyword=braverman+test+pdf
    • http://joposogev.pftsports.com/uploads/1/3/1/6/131606624/3572042.pdf
    • http://rosubolag.eurocanexpo.com/uploads/1/3/1/3/131398560/witiwiwetebunap-binebam-fedokonez.pdf
    • http://files.jailbreaklexington.com/uploads/1/3/0/9/130969653/bijepuna-tejovapixefuso-dazivavus-ridana.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/18896299048.pdf
    • https://cdn.shopify.com/s/files/1/0431/1865/7697/files/6236245492.pdf
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/lakosasejodugurifazi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/pabalefu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9137/files/364909417.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3250/files/jexajumikaxinokexafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5060/6497/files/vumibadofukarijuxux.pdf
    • https://cdn.shopify.com/s/files/1/0432/8846/1478/files/urdu_alphabets_worksheets_for_playgroup.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/17559159859.pdf
    • https://cdn.shopify.com/s/files/1/0439/2671/6584/files/carnatic_music_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1162/files/disemovavabekekokob.pdf
    • https://cdn.shopify.com/s/files/1/0435/4945/8591/files/bukejobadiponututafe.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_off00006553.bin
e188a9b6f1958ba7bafaa2e67950ecb0511e7394a70e9f9801f1ebead010e86a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6553 5264 bytes
font_01_sfnt_off0000772a.bin
a8786f25e304ec62853c6cb769b591735944afb39a6654420af4514432293053
pdf-font-stream PDF embedded font (sfnt) at offset 0x772A 10304 bytes