Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26ade2c27a3a458…

MALICIOUS

PDF

43.7 KB Created: 2020-08-10 05:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4b461b2e871201c67829ccbc2bce85e SHA-1: eb4b15efd7e9f1c9b23ef23f8741dcdb8a73d951 SHA-256: a26ade2c27a3a458593081fc746fc07f7fef2408bbee76ed860a6c64776d324b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical redirector link to ttraff.com. The document body, though heavily obfuscated, contains the same URLs, suggesting a lure to download further content. The ML classifier strongly flagged this PDF as malicious.

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=business+studies+a+level+pdf
    • http://files.csjmemorialfund.com/uploads/1/3/1/4/131453695/nogawew_kewopomimupus_vevog.pdf
    • http://files.israel-airport.com/uploads/1/3/2/6/132682681/b83fc.pdf
    • http://files.hounganjulian.com/uploads/1/3/1/3/131383283/fetejuvajuterudafab.pdf
    • http://files.palmdesertspacover.com/uploads/1/3/1/0/131070678/jorizaji.pdf
    • http://files.colleenscareercreations.com/uploads/1/3/0/9/130969761/41e898f3070.pdf
    • https://cdn.shopify.com/s/files/1/0428/5077/9295/files/maxosifedolixexawelalap.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/tovitefeze.pdf
    • https://cdn.shopify.com/s/files/1/0450/1933/2766/files/libro_apologetica_catolica.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1317/files/5603234340.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/blue_mountain_state_theme_song.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/kufivejofejutirogutamexan.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/the_a_team_ed_sheeran_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0437/2430/8630/files/27003076796.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/35728433766.pdf
    • https://cdn.shopify.com/s/files/1/0435/6374/5441/files/algebra_1_keystone_practice.pdf
    • https://cdn.shopify.com/s/files/1/0435/5309/5844/files/bulovufosukara.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/4575137306.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000631b.bin
efb87dfe37d21099cb9edbc9773940d51472dc8d0f552994d2c9dd5b53ec2229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631B 5048 bytes
font_01_sfnt_off00007464.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7464 1800 bytes
font_02_sfnt_off00007cf2.bin
f7c722c1070b6563f131fffd6185458537e7711893fb0ffe124ef7a95eb578c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF2 10652 bytes

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