Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcdf436caa0a4cc…

MALICIOUS

PDF

42.7 KB Created: 2020-08-30 08:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 394f0fdde05acfaae4151bdc342873b9 SHA-1: 81fed01a42769af33ce24e37e6440786725c9c92 SHA-256: 1bcdf436caa0a4cc6a380cdb65eb209e634ee4ea46b8ccfa635a6bc9ba9a2fd5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lure users into clicking on further malicious links. The document body, though heavily obfuscated, contains text related to a 'Whirlpool dryer f1 code' and the URL itself, suggesting a lure to trick users into visiting a malicious site. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm or redirection strategy.

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/wix?keyword=whirlpool+dryer+f1+code
    • https://cdn.shopify.com/s/files/1/0431/5221/2128/files/14708160321.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/aileron_control_reversal.pdf
    • https://cdn.shopify.com/s/files/1/0435/3861/2378/files/discord_won_t_pick_up_mic.pdf
    • https://cdn.shopify.com/s/files/1/0434/1710/8642/files/9750846780.pdf
    • https://static.usrfiles.com/ugd/b8c837_311c22bcd3a346988ed7ac3f2868541d.pdf
    • https://static.usrfiles.com/ugd/b8c837_39a7e07516dd45019b2af0ae4b07613c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a9900ea248a4ee1b9f7bee44bbebd19.pdf
    • https://static.usrfiles.com/ugd/cf79db_f03a6a4c74b14411a1e3f6a4e5c11c5a.pdf
    • https://static.usrfiles.com/ugd/d5415a_8bd14eeb6fcc4aaa8e2a4ec38ef47f77.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa573429fb52486d9ceffad07794d9fb.pdf
    • https://cdn.shopify.com/s/files/1/0435/4483/8303/files/swtor_synthweaving_schematics.pdf
    • https://cdn.shopify.com/s/files/1/0432/4868/1120/files/medimaniresiwe.pdf
    • https://cdn.shopify.com/s/files/1/0435/8805/9293/files/82049150819.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_off00005dc9.bin
f1ac09cb81337455d96b904a256abab838bc4cdc906a3959020477a407bb00eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC9 4624 bytes
font_01_sfnt_off00006d9d.bin
8e20bb73adb2a026a4d70ce14e43808ffa6080901c6bb34c6d5d64080664434a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9D 10164 bytes
font_02_sfnt_off00009058.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x9058 4324 bytes