Malicious PDF — malware analysis report

Static analysis result for SHA-256 076c8646be77b4cb…

MALICIOUS

PDF

60.9 KB Created: 2020-08-06 20:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28bac73d0dcc38725b4d3933af5029bd SHA-1: 8282490003d2f69b978ed89ee3333fe52af17762 SHA-256: 076c8646be77b4cbac3e7cd7a0e79cb13a9f2caa282d264ee5891eed1acf0724
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to trick users into clicking it. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves using a seemingly relevant document to drive users to malicious infrastructure.

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=allahabad+high+court+review+officer+previous+year+paper+pdf
    • http://bofanimas.whitehousegrill.com/uploads/1/3/1/3/131384635/3953773.pdf
    • http://rugoroj.danielcharlesconroy.com/uploads/1/3/0/8/130813765/4bfd8edb2fda7.pdf
    • http://files.robertgoldenfineartltd.com/uploads/1/3/2/3/132302910/pazimawutevojo.pdf
    • http://files.papapasseros.com/uploads/1/3/2/6/132695575/175862d7dc09.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7796/7778/files/kitopadunak.pdf
    • https://cdn.shopify.com/s/files/1/0430/1894/4665/files/86900278721.pdf
    • https://cdn.shopify.com/s/files/1/0436/2053/2384/files/gokewobifemepofinona.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/kuvalusa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0036/5215/files/hat_in_time_mods.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1261/files/junuforaguvetenek.pdf
    • https://cdn.shopify.com/s/files/1/0428/4419/2935/files/9757607585.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/63878521135.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/xarizaso.pdf
    • https://cdn.shopify.com/s/files/1/0427/9464/7719/files/62185331003.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/luvutalanopijomakel.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_off0000ae12.bin
a9fd4f6350d9af80eadb46a096d87036614671e56c40641ece059242a59cac4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE12 5800 bytes
font_01_sfnt_off0000c1e3.bin
99cd37551c75523c69868e0be0b756d2f455ba064e791f7bbe5cecb96607544f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E3 10764 bytes