Malicious PDF — malware analysis report

Static analysis result for SHA-256 740b2475bbe3e32e…

MALICIOUS

PDF

33.7 KB Created: 2020-08-17 08:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 803f515385e935b7dd158fe6fbed120e SHA-1: 90af54af89d7433e249405bd2ada7376224e2b16 SHA-256: 740b2475bbe3e32eae4fca80421fce6ab0a25be9a6d7a398ac5e9edd03a42fda
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to link farms hosted on Shopify. One of the primary links redirects to `https://ttraff.ru/pify?keyword=messenger+lite++apk+pure`, which is flagged as malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same lure text and URLs, indicating a deliberate attempt to trick users into clicking malicious links.

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/pify?keyword=messenger+lite++apk+pure
    • http://files.sittichai.com/uploads/1/3/2/6/132681713/zuzexujuwojugo_topazajizonim_xuzanepe.pdf
    • http://files.mclewis63.com/uploads/1/3/1/4/131411539/9484429.pdf
    • http://zutazofog.valweedonmbe.net/uploads/1/3/0/8/130813550/bivebetuzekut.pdf
    • http://fomesos.myflamingheart.com/uploads/1/3/1/4/131406427/0baeb3614eb4.pdf
    • http://pufajudir.capturedmemoriesbyc.com/uploads/1/3/2/6/132695615/8367574.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9869/3022/files/php_ip_address.pdf
    • https://cdn.shopify.com/s/files/1/0437/2430/8630/files/norikosapegemexuxive.pdf
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/3018049083.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8454/files/44508038942.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/40855369427.pdf
    • https://cdn.shopify.com/s/files/1/0434/9768/5157/files/kumazib.pdf
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/lexevujobutijuxivo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/2444760337.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gojifazuxosupimuron.pdf
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/fitness_trampolin_bungen.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_off000047e1.bin
bf0e90fc41018fce6a67ccb9d7d0942ac0cb7389e93d6e90e0ecb1f522c13dfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x47E1 5056 bytes
font_01_sfnt_off00005928.bin
5e76ac94eb33dbef015a8a7709f786cf918947f36bac631e7aa9334fee3ea53c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5928 9652 bytes