Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac5442b40e3f4f9…

MALICIOUS

PDF

67.7 KB Created: 2020-08-03 20:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aea8c651036918d817ec7652a7dbcc8 SHA-1: 316f3bc71be17e18bcdb1ea9a6a93abaa85d5739 SHA-256: 7ac5442b40e3f4f994d38066da0f25c362dc55419ca8ddc37ba9e8e227ddfb4a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate resources but ultimately redirect to a known malicious domain (ttraff.ru). This technique is commonly used to distribute malware or phish for credentials. 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.ru/pify?keyword=balanced+scorecard+example+manufacturing+company+pdf
    • http://files.totternhoememorialhall.com/uploads/1/3/1/3/131379134/21409c692d.pdf
    • http://files.sbednarski.net/uploads/1/3/1/4/131484328/6fa309.pdf
    • http://files.cornerhealthfoods.com/uploads/1/3/0/7/130738943/dofijikolofa_gabuzu_bifuvutijoked_xuwudaxeda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1740/2530/files/bilurazuga.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/nujex.pdf
    • https://cdn.shopify.com/s/files/1/0434/1668/2663/files/lugujunodadatu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9021/5073/files/koludimatilabomilit.pdf
    • https://cdn.shopify.com/s/files/1/0430/4342/2359/files/kuvunelulupiwuwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/investment_valuation_damodaran.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2831/files/53593560525.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/javascript_play_sound.pdf
    • https://cdn.shopify.com/s/files/1/0431/8982/9800/files/28075361784.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/18284492425.pdf
    • https://cdn.shopify.com/s/files/1/0437/7031/4903/files/kenmore_ice_maker_not_working.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_off0000cb27.bin
cc5c6bfdf1f90b74de95fd5cd96b2f54ef350033c8b79c07ca8e97929cc24e6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 5696 bytes
font_01_sfnt_off0000de7b.bin
eab76f2e17f8d82321d195320ae70e691b94a6e603126b08a73b6bb453b73b18
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 10316 bytes