Malicious PDF — malware analysis report

Static analysis result for SHA-256 612d57da5731008e…

MALICIOUS

PDF

35.2 KB Created: 2020-08-02 23:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41a2f768d8efe517f7a8f3934ed12ec6 SHA-1: ecc683fa3d7108546ca6c1f8ef2ec8737bbadd09 SHA-256: 612d57da5731008e4eb63e5f52136d5c07aed0e27d5ef910dea41e1cf85bca1d
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL https://ttraff.ru/pify?keyword=random+four+digit+number+generator. The presence of numerous PDF links, many hosted on Shopify, suggests an attempt to obscure the malicious destination and potentially leverage legitimate platforms for distribution. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or redirection attack.

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=random+four+digit+number+generator
    • http://files.serenaashley.com/uploads/1/3/0/8/130814636/7683596.pdf
    • http://files.leahdanielsbutler.com/uploads/1/3/1/4/131453267/b1850836626fcf.pdf
    • http://files.lifestylefrugalist.com/uploads/1/3/0/9/130968993/2877159.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/93789206116.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.pdf
    • https://cdn.shopify.com/s/files/1/0435/8298/0259/files/sejokixobofedo.pdf
    • https://cdn.shopify.com/s/files/1/0436/5654/4409/files/google_chromecast_images.pdf
    • https://cdn.shopify.com/s/files/1/0434/6930/8061/files/18465072166.pdf
    • https://cdn.shopify.com/s/files/1/0429/1385/7692/files/17031520490.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1641/files/lukazojafilutizagifufusel.pdf
    • https://cdn.shopify.com/s/files/1/0431/6318/9412/files/permutation_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/78305727276.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/zugobotuliwobutuwuzarigu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/18810165552.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_off00004868.bin
309e8a1ca04546ae601a02717eb475bd1b44435bf8ef89ea1259c3ad812e3714
pdf-font-stream PDF embedded font (sfnt) at offset 0x4868 5164 bytes
font_01_sfnt_off000059ee.bin
075a32177299e12c88f75c3a8ee83453d2ed5b237d9c4b140d6076b4c862345c
pdf-font-stream PDF embedded font (sfnt) at offset 0x59EE 12092 bytes