Malicious PDF — malware analysis report

Static analysis result for SHA-256 1491436bae45ff99…

MALICIOUS

PDF

46.8 KB Created: 2020-09-09 00:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d9e9a33b9eea71b45e95bdaf5335588 SHA-1: eef29ebc9433a839f7c936b41dfd3cf25096c735 SHA-256: 1491436bae45ff99313e5cdada7695860798834d7d5a4774fdab20cfd7a14fb7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://ttraff.club/wix?keyword=genetically+modified+corn+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and other PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the use of a malicious link within a document to redirect the user to a harmful site.

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.club/wix?keyword=genetically+modified+corn+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/fc840b_56be70a9a8fd4c599823a3e51bd14d8c.pdf
    • https://static.usrfiles.com/ugd/f1d680_babe971bd4714b2188d6a4d221dcdaae.pdf
    • https://static.usrfiles.com/ugd/b8c837_88e5ae1a84cb4ed89e333e06beae123e.pdf
    • https://static.usrfiles.com/ugd/37428b_7ae00afb68c641d0b5948eaab75f5650.pdf
    • https://cdn.shopify.com/s/files/1/0435/5581/5583/files/retamewamewomigawilebam.pdf
    • https://cdn.shopify.com/s/files/1/0432/7152/0414/files/uninstall_mysql_from_mac.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2404/files/accountancy_class_11_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/aix_operating_system_commands.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/dukinerom.pdf
    • https://static.usrfiles.com/ugd/fd30ac_7f2803de39d04163857d270d346e94d5.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_7b1d5fc2681546e7bab1cf0c84962abd.pdf
    • https://static.usrfiles.com/ugd/97aff7_cc2510a0db924fd79d3feb1bd6c55881.pdf
    • https://static.usrfiles.com/ugd/96564c_ebb885f18cc244738aa3c7722270b810.pdf
    • https://static.usrfiles.com/ugd/0a593f_b8060784cf0842d295d43b820d970b48.pdf
    • https://static.usrfiles.com/ugd/b8c837_c558f0fe94124d7e8cb83514f51fbdba.pdf
    • https://static.usrfiles.com/ugd/b8c837_75a434bea9084e5ca4fdfe3bb1499848.pdf
    • https://static.usrfiles.com/ugd/2f8cea_9018cb9c87dd43d88a91f11ef68b5672.pdf
    • https://static.usrfiles.com/ugd/92ee2b_84fcc216366b486d8b540f17f75647b8.pdf
    • https://static.usrfiles.com/ugd/93c935_e737132502ef400db78bed8bce4f0bd1.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007929.bin
e8f7680d5db6ce3245288b0d1ac2a389933b94acc399d6661e7d99283f08d229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7929 5256 bytes
font_01_sfnt_off00008b05.bin
ed624d5894aaa0bdd06d0baf6e1f1284fba7131c2ca3ad9749a017902f67eba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B05 10256 bytes

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