Malicious PDF — malware analysis report

Static analysis result for SHA-256 586f7a15095606cc…

MALICIOUS

PDF

47.3 KB Created: 2020-08-09 00:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0796b71dd728243b5e632d46c26373b6 SHA-1: 1775d179b9109d0781cd7dc718d80ae98bb24be8 SHA-256: 586f7a15095606cc1393ff579c50b671bde021fcc4dc8188f953e78cde93543d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing:Spearphishing Attachment T1204.002 Malicious File:Malicious Link

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. One URL, 'https://ttraff.cc/wb?keyword=stoic%20mindfulness%20and%20resilience%20training%20(smrt)%20pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be SEO manipulation or the distribution of further malicious content via these 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.cc/wb?keyword=stoic%20mindfulness%20and%20resilience%20training%20\(smrt\)%20pdf
    • http://files.undisputedboxing.ca/uploads/1/3/1/4/131454304/ea91b4b82f45ba.pdf
    • http://files.remembermegenealogy.com/uploads/1/3/0/7/130739368/lumirawo.pdf
    • http://files.homebirthsupply.com/uploads/1/3/0/7/130775471/6452645.pdf
    • http://files.amersonelite.com/uploads/1/3/2/8/132816066/6455256.pdf
    • https://cdn.shopify.com/s/files/1/0436/0133/0339/files/96684886619.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8733/files/xewidubijagu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/45586129527.pdf
    • https://cdn.shopify.com/s/files/1/0439/4962/1406/files/because_he_lives_hymn.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/giboduzid.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/51566557455.pdf
    • https://cdn.shopify.com/s/files/1/0431/7301/9808/files/30583041639.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8375/files/gunufutuxolepedizupapuzok.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/96590976540.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0862/files/aldous_huxley_italiano.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_off00007a83.bin
41b609f516245a6436288c76df1d0a900d69a1d5c323c823631fb4d2117172c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A83 5732 bytes
font_01_sfnt_off00008e02.bin
babff155d771ca2e5241c4d433e5e701c8ef270aba350a35ae347c7738a285d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E02 10012 bytes