Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9f9627d16309e0…

MALICIOUS

PDF

42.4 KB Created: 2020-09-08 05:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32794ded3409926a1f69d4bec1bf780f SHA-1: 03165b113907ac92d811a909ca29e99b6971d6b0 SHA-256: df9f9627d16309e01271571f04d0ab1a3d100c98cb73ede881fa1bcccd8f3e98
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing for a PDF link farm. One of the primary URLs, 'https://ttraff.link/wix?keyword=b.+t.+c+form+date', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to forms and dates, potentially luring users to click the malicious links. 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.link/wix?keyword=b.+t.+c+form+date
    • https://cdn.shopify.com/s/files/1/0450/6012/8931/files/bsf_tradesman_answer_key_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0964/files/php_drop_down_menu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3638/4159/files/android_wear_smartwatch_cheap.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/10895380494.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7473/files/27998141834.pdf
    • https://static.usrfiles.com/ugd/c63dba_b18191c164cb4c11b744d525bc6f6a41.pdf
    • https://static.usrfiles.com/ugd/1f2646_a29093ee820b4aae9ca0848873e67408.pdf
    • https://static.usrfiles.com/ugd/9c0842_2ce244bd784342409b02bcdf4d9dbb27.pdf
    • https://static.usrfiles.com/ugd/8cbfce_5d59df654f704fc8827e170285e3985f.pdf
    • https://static.usrfiles.com/ugd/d48fe3_b2b74996d04944b99c6aa1a23467a8ec.pdf
    • https://cdn.shopify.com/s/files/1/0435/4634/5636/files/play_store_song.pdf
    • https://cdn.shopify.com/s/files/1/0437/5746/9845/files/tigekewugej.pdf
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/rupojabomodowumebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2655/4781/files/wabaxaw.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_off000068f1.bin
a8e97b40419fecfdc2ebe8a9c2192ac5098d28916bb71c5ed09461cb9d3effec
pdf-font-stream PDF embedded font (sfnt) at offset 0x68F1 5036 bytes
font_01_sfnt_off00007a01.bin
e06ecadbda078151f935f1b43ab5377a816cd90dc2ac08019e74074a0117ab33
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A01 10328 bytes