Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa42fc6aed3a307f…

MALICIOUS

PDF

42.5 KB Created: 2020-08-10 10:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c618ef745547ddddd3080d68d4c8e824 SHA-1: f1968236e0601cf72fbf7d16dd0d1b1afa5a4039 SHA-256: fa42fc6aed3a307f09b71a716a23e32a6f3b1e2d655f4edc3bddb93449c81402
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=oreo+persuasive+writing+pdf'. Another critical heuristic identified a PDF link farm, with the first URL pointing to 'https://cdn.shopify.com/s/files/1/0430/0632/8995/files/96989439388.pdf'. The document body, though heavily obfuscated, contains references to 'oreo persuasive writing pdf' and the same malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=oreo+persuasive+writing+pdf
    • http://files.mccrearykennel.com/uploads/1/3/1/6/131607163/xizam.pdf
    • http://files.orilliasilverband.com/uploads/1/3/0/9/130969428/1851768.pdf
    • http://files.mybowerstudio.com/uploads/1/3/0/7/130776503/xowijujigixala.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/96989439388.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/babasetaxoguvivowe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6730/9206/files/1904764256.pdf
    • https://cdn.shopify.com/s/files/1/0429/4141/5587/files/buzorurovuwufajimarex.pdf
    • https://cdn.shopify.com/s/files/1/0437/8833/7313/files/36279747251.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/19641394095.pdf
    • https://cdn.shopify.com/s/files/1/0432/5815/1072/files/watermark_adobe_reader.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3253/files/woodland_park_weather.pdf
    • https://cdn.shopify.com/s/files/1/0437/6100/8791/files/17376735745.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/alp_and_technician_admit_card_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7594/4091/files/lafipawulakovek.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5979/files/rezekorunigegufetugobalo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39748763391.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_off00006811.bin
beb0ceab2b249f3fcb41f634e0f712e285587fd9ab9551ffffcabb430c371950		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6811 5356 bytes
font_01_sfnt_off00007a6f.bin
82be1a7f23a1607b4da20c01a4b7682fab1b13be06976f9cd8f3d7d9ae9bfb51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6F 10296 bytes

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