Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b64465a9a052b06…

MALICIOUS

PDF

45.0 KB Created: 2020-08-09 19:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1c4079a1d5cef6c9d45276b63d6e917 SHA-1: 535caf80c8bba90ac9e791515b217e04e15008dc SHA-256: 2b64465a9a052b068753aef25724197c8c7a443998d2762cba13c24e90a5513b
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though obfuscated, contains the same URL and keywords suggesting a lure for social media marketing strategy. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via embedded 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.ru/pify?keyword=facebook+social+media+marketing+strategy+pdf
    • http://files.littlesavoy.net/uploads/1/3/0/9/130969059/a9f507c33bc8e9.pdf
    • http://mafasiga.melissashanley.com/uploads/1/3/1/8/131857631/notodupumigiruja.pdf
    • http://files.emsteacher.com/uploads/1/3/1/3/131383323/fopobefutukefa-nuxozozakuleka.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6209/files/89128254146.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/dojajajogiwivubesixunuwod.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4981/files/61296774170.pdf
    • https://cdn.shopify.com/s/files/1/0429/3656/5923/files/vobitudikimu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5017/1554/files/dch_file_ting_trung_sang_ting_vit.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3861/files/33721426240.pdf
    • https://cdn.shopify.com/s/files/1/0434/2074/5893/files/6181469364.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/production_of_red_blood_cells.pdf
    • https://cdn.shopify.com/s/files/1/0429/5622/6716/files/13022152559.pdf
    • https://cdn.shopify.com/s/files/1/0434/1838/6588/files/create_maven_repository.pdf
    • https://cdn.shopify.com/s/files/1/0438/3096/8480/files/52082347206.pdf
    • https://cdn.shopify.com/s/files/1/0447/3847/8229/files/advertisement_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0958/files/47466544090.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_off00006f38.bin
a6bc4180f73d7b08279313b154039ff3a50c36c9b279049a6e0873ae24e909e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F38 5736 bytes
font_01_sfnt_off000082ab.bin
f0098be48eab06a79fb2f697fa52bdd723dd4a815fbe3f036f5d7c8736bf5bf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x82AB 10580 bytes