Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab621eca79eab5cf…

MALICIOUS

PDF

50.7 KB Created: 2020-07-27 14:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3508248bbaf12f77dc547e62b4964acd SHA-1: d1c197e5a2e700761e6d2ac122f72a4690526f85 SHA-256: ab621eca79eab5cf83a8627650c3f7fd0c0574d4108c4001c539b1b226f9481a
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector infrastructure at ttraff.com. The document body, though heavily obfuscated, suggests a lure related to a "Wisconsin dnr hunter safety study guide", likely intended to trick users into clicking the malicious links.

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=wisconsin+dnr+hunter+safety+study+guide
    • http://files.anotsoemptynest.com/uploads/1/3/0/8/130814085/0cc89622a.pdf
    • http://files.nmschoir.com/uploads/1/3/0/8/130813546/8824313.pdf
    • http://files.manawatugymsports.com/uploads/1/3/0/7/130776327/repukujejaget_negomopopakora_libaboditawa.pdf
    • http://files.neiljohannsenart.com/uploads/1/3/0/8/130874380/9056561.pdf
    • https://cdn.shopify.com/s/files/1/0431/4418/3974/files/74758889875.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/gopamulirusakipibav.pdf
    • https://cdn.shopify.com/s/files/1/0438/5823/1461/files/votetuziza.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7287/files/jofigijo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0135/files/vadarivarag.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/guwevaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/jovibofegubogum.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1927/files/59510121275.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/23428922624.pdf
    • https://cdn.shopify.com/s/files/1/0430/6095/3249/files/vojiwigojojotoxibufufuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1751/files/tipumujiw.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/
    • https://cdn.shopify.com/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087ba.bin
fa7e36682708129ede22d3e7ca0d9cb70804179ffb2af8cd8b69dae6dca0fb49
pdf-font-stream PDF embedded font (sfnt) at offset 0x87BA 5248 bytes
font_01_sfnt_off00009993.bin
9f55e532db42c70c530971bfc41d3622f3b085818500660edd0412fdd8118f59
pdf-font-stream PDF embedded font (sfnt) at offset 0x9993 10560 bytes