Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a3059f2dc8c122…

MALICIOUS

PDF

40.3 KB Created: 2020-08-22 14:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddd63ff934dc857486bb8807b7bd0ecb SHA-1: da222f030bff879a683c8d90825c011e440020f1 SHA-256: 61a3059f2dc8c122bb6ccb239246471af92dbe0a2ee3b13ee64bf950c0dd371c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector infrastructure, which is a common tactic for distributing malware or phishing pages. The document body and embedded URLs suggest a lure related to 'Instagram dark mode apk ios', likely to trick users into downloading malicious content or visiting a phishing site. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points to a link farm or SEO manipulation for distribution.

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.com/pify?keyword=instagram+dark+mode+apk+ios
    • http://files.asliors.com/uploads/1/3/1/3/131379213/222c5.pdf
    • http://lozen.uoftmedadmissions.com/uploads/1/3/0/8/130874493/togesodamewi_voxakafex_tugutaw.pdf
    • http://files.newcreationsdc.com/uploads/1/3/2/7/132741352/1d9f56fd9028.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4980/3162/files/kalunafizogogeriwilufabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9708/7390/files/95867316126.pdf
    • https://cdn.shopify.com/s/files/1/0432/3672/0808/files/98137369393.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/26730448162.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/xugesomokov.pdf
    • https://cdn.shopify.com/s/files/1/0437/7506/6273/files/acs_exam_organic_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/96569530776.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1369814796.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7263/files/deauthorize_callback_url.pdf
    • https://cdn.shopify.com/s/files/1/0439/4899/8811/files/toro_6._75_149cc_manual.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_off00006101.bin
6764f11d56879d5df232d80791e28f5c6e973ca5c3262ff5030406617bc1a857
pdf-font-stream PDF embedded font (sfnt) at offset 0x6101 5248 bytes
font_01_sfnt_off000072c3.bin
4c8a3e59b2573eaf14497f2f25d9da8b6d38371ea7af0833c08ccb67a3b41420
pdf-font-stream PDF embedded font (sfnt) at offset 0x72C3 9980 bytes