Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d3aa17735d6a1f…

MALICIOUS

PDF

53.7 KB Created: 2020-08-09 01:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37713847f440d32c06eec91e95f4a60e SHA-1: 232a13329d43947ab298204e0dc09cb6dc920433 SHA-256: e3d3aa17735d6a1f0513117f5949f9629eb11bb675debab97175ac6648367ff1
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=ata+100+chapters+list+pdf'. Additionally, it features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the same malicious URL, reinforcing the intent to redirect the user.

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=ata+100+chapters+list+pdf
    • http://files.spinecarechiropractic.net/uploads/1/3/1/3/131384018/30437.pdf
    • http://files.suffolkmysteryauthorsfestival.com/uploads/1/3/0/9/130969705/voxivin.pdf
    • http://files.friendsofhuruma.org/uploads/1/3/1/4/131410012/46217f.pdf
    • http://files.afterimagestaxidermy.com/uploads/1/3/0/8/130874238/xapedorikored_xikex_gasonukogowovu_vuxezisapopuzin.pdf
    • http://gexekazi.alamancechildren.org/uploads/1/3/0/7/130738836/sidaxivafofom.pdf
    • https://cdn.shopify.com/s/files/1/0433/7529/6677/files/33217761020.pdf
    • https://cdn.shopify.com/s/files/1/0430/2418/7549/files/76188854130.pdf
    • https://cdn.shopify.com/s/files/1/0430/4112/8601/files/88217894536.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1000/files/fasting_lipid_profile.pdf
    • https://cdn.shopify.com/s/files/1/0431/8461/9680/files/jaxadelesisewenake.pdf
    • https://cdn.shopify.com/s/files/1/0435/4156/1503/files/51953476370.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/22577288160.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2077/files/pirudusowe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7188/8803/files/sezososipoginevujegomozum.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/30019199165.pdf
    • https://cdn.shopify.com/s/files/1/0432/6667/0745/files/18572770541.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_off000087b4.bin
3c661ddcbb93ad3d7f8dec8f93b680c8445d9d6733e16d8ebdc4fd516e7f0000
pdf-font-stream PDF embedded font (sfnt) at offset 0x87B4 5424 bytes
font_01_sfnt_off00009a20.bin
276653e0b9f0af473eb8063d632ac81366a879af546de23f9078ba1fb547b53e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A20 15852 bytes