Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ba538a7b67d72a…

MALICIOUS

PDF

49.5 KB Created: 2020-08-29 02:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 100df58fd6c0a131cc7efe39f26475b3 SHA-1: d9ae053b098542e0d7f637d182ae24a9b7ac29b1 SHA-256: e0ba538a7b67d72aed7da01f63eef53f1e49e4ce50451319190b3cac12616173
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.ru/wix?keyword=baucis+and+philemon+story+pdf'. Additional heuristics indicate a link farm and ML classification strongly suggests maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing its role as a lure. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure.

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.ru/wix?keyword=baucis+and+philemon+story+pdf
    • https://static.usrfiles.com/ugd/b8c837_7fcee2258a4d418ea635d4094cd36c73.pdf
    • https://static.usrfiles.com/ugd/b8c837_fee71b3bd88146f2b0e4431291e2abf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_998863c5d1334780be8abf5439391b29.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5958/files/zewew.pdf
    • https://cdn.shopify.com/s/files/1/0434/2729/9478/files/exam_master_book_january_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/44213193372.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/51449974418.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/age_of_industrialisation_class_10_notes_mycbseguide.pdf
    • https://cdn.shopify.com/s/files/1/0437/4963/8295/files/16284097233.pdf
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/vefifikudobug.pdf
    • https://cdn.shopify.com/s/files/1/0435/7960/5147/files/batman_arkham_knight_skins.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7354/files/mazazupegedinukaxevexazex.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/xijaxakaliwafebaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/5298/2684/files/padaleruvadod.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/
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075a7.bin
95c6bd71fcdfe5b58ca2d383831ef571a8397de5be53a85a0a3eea619819e6d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A7 5428 bytes
font_01_sfnt_off000087e8.bin
73baac08cf87f094faeb0af011da24ee2274655ce10ed62a471cc9b9edbaf8e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87E8 10156 bytes
font_02_sfnt_off0000aa9b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA9B 4324 bytes

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