Malicious PDF — malware analysis report

Static analysis result for SHA-256 acacc36b5b25046a…

MALICIOUS

PDF

38.3 KB Created: 2020-08-08 14:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6445ea5aa4b2c14dc8b6b763f47fee1 SHA-1: 3887665c22be0aa91c80af7c8f09fae27a4aeb3c SHA-256: acacc36b5b25046ab95bfb5813c1110fe69a4c69e657fe1385d99b54724f36f7
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, creating a link farm for SEO manipulation. One prominent link, 'https://ttraff.com/pify?keyword=thinking+in+java+pdf+latest+edition', is identified as a malicious redirector. This suggests the document's primary purpose is to drive traffic to malicious sites, likely for further exploitation or phishing. No scripts were extracted, but the heuristic firings strongly indicate a malicious redirection scheme.

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=thinking+in+java+pdf+latest+edition
    • http://files.glenoakscommunity.org/uploads/1/3/1/3/131378932/runeru.pdf
    • http://files.preciousmomentslivebymichelle.com/uploads/1/3/1/1/131164009/ccf5ad95b9a5.pdf
    • http://files.totnesyoga.co.uk/uploads/1/3/1/1/131164125/gedirijabu.pdf
    • http://files.youcanchangeeducation.org/uploads/1/3/2/6/132682892/vixavimitubalu_pukuv_pakuj_rodifuwaxison.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6261/files/gidurakisebe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6985/8214/files/hindu_gods_family_tree.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/nelukatabiminakugefevatuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/7729/5516/files/38513290927.pdf
    • https://cdn.shopify.com/s/files/1/0434/0783/5293/files/tuxubevesebinaxodotej.pdf
    • https://cdn.shopify.com/s/files/1/0435/7645/9427/files/sugerixupomij.pdf
    • https://cdn.shopify.com/s/files/1/0438/1271/6701/files/kofulejonumumujamera.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6422/files/9488553740.pdf
    • https://cdn.shopify.com/s/files/1/0429/1896/9507/files/2240362757.pdf
    • https://cdn.shopify.com/s/files/1/0440/1335/5166/files/tixudozudupuluvivoliso.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/mevuzu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2782/2752/files/allardyce_nicoll_british_drama.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_off000057dc.bin
24cd8724600cb790edc1b483896a20349eb843c77ff8ae4f234fa348885a23fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57DC 5356 bytes
font_01_sfnt_off00006a29.bin
1a45fa94dd47514927eb3ebdbb69bf69a0e65df11c4b59968c4c2fcea13a0a60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A29 10016 bytes

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