Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5cdc951d2034ce…

MALICIOUS

PDF

43.0 KB Created: 2020-08-01 21:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3333dfb7f90ed98dde07a693625dae3 SHA-1: cacd5bd2a51d78f4c488f703c58cdd6ef19fdd23 SHA-256: ba5cdc951d2034ce24b42b21ae239560eb85676fb67fd41a2670ee28bc54d421
192 Risk Score

Malware Insights

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

The PDF contains numerous invisible links, including one pointing to the malicious redirector ttraff.ru. The heuristic PDF_CAPTCHA_LINK_LURE indicates these links are designed to appear as CAPTCHA elements to trick users into clicking them. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious infrastructure through these disguised links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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=acls+provider+manual+2015
    • http://files.smokeandmirrorspi.com/uploads/1/3/1/3/131381259/wuwigukadufi-gawalagusiwarux-mopuwa-wateteved.pdf
    • http://files.theconfidencevault.com/uploads/1/3/1/8/131856244/gawobewerisovum.pdf
    • http://files.highadventurecomics.com/uploads/1/3/1/4/131438419/sarili_simulis.pdf
    • http://files.thepaperbackblog.com/uploads/1/3/1/6/131606027/mibipukem-butisifi-pomuj-punesi.pdf
    • http://files.kitchengallerydesign.com/uploads/1/3/2/6/132680808/4026470.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/5268083020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0848/2710/files/nidup.pdf
    • https://cdn.shopify.com/s/files/1/0439/3048/4904/files/recaptcha_google_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5290/files/68378337574.pdf
    • https://cdn.shopify.com/s/files/1/0428/2010/8455/files/pazesedavujiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/mukufogofitovovu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4345/4102/files/35973017878.pdf
    • https://cdn.shopify.com/s/files/1/0438/0105/1293/files/71318654553.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0933/files/34553174077.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/mixajaxajetaxugaxabaker.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/52101201708.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068e2.bin
d08a37a655419b6826cd463698ab2204db2ed301e0dd4a3d28e1fe6384128866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E2 5716 bytes
font_01_sfnt_off00007c54.bin
c98d40a34218f0d3b0ebd0f344454b296e4bce2c5257f9ef8a22a61c1a15bfa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C54 10312 bytes

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