Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc724acadce371f…

MALICIOUS

PDF

47.0 KB Created: 2020-08-07 16:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 183acebd8f31e0778d0a73fd15051161 SHA-1: bede47f99a3849ef26921f9ffadcacc9529f0d65 SHA-256: dbc724acadce371f717ec54b176ddb1ff19b628ea368b959c9ecbec053cdf593
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, which is likely intended to lead users to malicious content. The presence of numerous embedded links, many pointing to Shopify domains but some to unknown hosts, suggests a broad distribution attempt. No scripts were extracted from this sample.

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.cc/pify?keyword=apastamba+grihya+sutra+sanskrit+pdf
    • http://rirag.velellaboat.com/uploads/1/3/2/6/132683014/7452942.pdf
    • http://files.myhealthwealthimpact.com/uploads/1/3/0/9/130969663/bfed8e1f.pdf
    • http://files.holidaycottagediss.com/uploads/1/3/0/7/130776176/6201440.pdf
    • http://files.santenkarate.com/uploads/1/3/1/0/131070722/xogid.pdf
    • http://fudulazow.honeybeeman.com/uploads/1/3/1/4/131453541/wulidowaxudezi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0904/files/annexure_3_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/5312/0669/files/jobimot.pdf
    • https://cdn.shopify.com/s/files/1/0431/4788/6743/files/gesoludozuxojemixof.pdf
    • https://cdn.shopify.com/s/files/1/0438/2710/1853/files/dizijapesiwo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/lalamikebajibokukusirusij.pdf
    • https://cdn.shopify.com/s/files/1/0434/2707/0104/files/69035448904.pdf
    • https://cdn.shopify.com/s/files/1/0435/6076/3555/files/21462878829.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/nirevazedofojemezafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9277/8916/files/45103772212.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/bujuwoseruxes.pdf
    • https://cdn.shopify.com/s/files/1/0431/4945/9605/files/24700855787.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/jezoloxajakuze.pdf
    • https://cdn.shopify.com/s/files/1/0431/3835/1255/files/adrenal_insufficiency_pediatrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/33081019785.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/s/files/1/0431/3835/1255/files/adrenal_insufficiency_pediat

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ddd.bin
09119ead84f709ff77886739e52808b5cac14712b9d09c1756f47c899c59382e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDD 5720 bytes
font_01_sfnt_off00008132.bin
0a5ac0340bed1a6c152ebdb2ec97b84f8398648787e05cf7c7d506d6d5a40966		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8132 10152 bytes
font_02_sfnt_off0000a437.bin
c00bda8fde733e692c1462c18eb95440810b1201d73384b8e363886d00b1654a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA437 2544 bytes

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