Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9db4516952013e…

MALICIOUS

PDF

40.3 KB Created: 2020-08-15 01:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c7baa95e48fd61fb80c35e035249830 SHA-1: 8a62e773b5cdf0fd85cb6c489d604ff5a7536f37 SHA-256: 6f9db4516952013e40bd8b65193aed3ce3ca0d64300cbaf206fe37e612b1c90d
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, disguised with a lure of interview questions. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest a phishing or scam attempt. Although no scripts were extracted, the PDF structure itself facilitates the redirection.

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=azure+interview+questions+and+answers+for+freshers
    • http://files.atmorepubliclibrary.com/uploads/1/3/1/3/131378779/remirisiwax-kotofeloxut-kofetevafizu.pdf
    • http://nafolovon.peanutandpiglet.co.uk/uploads/1/3/0/8/130813547/3828574.pdf
    • http://files.artedelaura.com/uploads/1/3/1/3/131383934/9252528.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4781/3269/files/badasaxebizezar.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/javutunodafigidegumipivut.pdf
    • https://cdn.shopify.com/s/files/1/0427/8163/8812/files/dinugamawuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/3090068595.pdf
    • https://cdn.shopify.com/s/files/1/0431/0669/7367/files/spotify_desktop_equalizer.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6995/files/pefakaka.pdf
    • https://cdn.shopify.com/s/files/1/0438/5089/1424/files/11340992214.pdf
    • https://cdn.shopify.com/s/files/1/0436/3704/7449/files/xakuxunoruludovon.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/6378230272.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8695/files/mogax.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_off00005dcf.bin
441703f8e9af5f274547dbe6b55f1a5a4b58e66175b3aa6705aff61be4e4a76a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCF 5280 bytes
font_01_sfnt_off00006fdb.bin
1419654bceade17ac17e014b7ccfc4fb7efbd47d396a67e6a47de7e1b8f23bc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDB 10908 bytes