Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0bb255e866e6fb…

MALICIOUS

PDF

47.0 KB Created: 2020-08-24 20:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da89f3a1c1e6c49886ab56b2ec18d5b8 SHA-1: b2f48077497cb7cf32685cebd4ef8053abb3ae55 SHA-256: 3b0bb255e866e6fb2c5d84618c19613487b7981fea3814c893863a3404e7b53d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a significant number of embedded links pointing to various PDF files, indicating a link farm. One of these links, 'https://ttraff.ru/pify?keyword=aashiqui+mein+teri+new+song++djpunjab', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector and the link farm strategy strongly suggest a phishing or malware distribution attempt.

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=aashiqui+mein+teri+new+song++djpunjab
    • http://files.wreckingmachine.net/uploads/1/3/1/4/131406684/5026535.pdf
    • http://rapaliv.artistryofwildlife.com/uploads/1/3/2/7/132740405/9951096.pdf
    • http://siwosi.678vintagecameras.ca/uploads/1/3/1/4/131406071/virerewiz-joluvugozeguj-mudifujudevax-xinanuwonadiju.pdf
    • http://siwosi.678vintagecameras.ca/uploads/1/3/1/4/131406071/virerewiz-joluvugozeguj-mud
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/70909848179.pdf
    • https://cdn.shopify.com/s/files/1/0429/0969/6156/files/xoroxitazarepamikipeza.pdf
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/drte_hansen_altes_land.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/58148347361.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79894841610.pdf
    • https://cdn.shopify.com/s/files/1/0438/0845/6865/files/sunamelonodat.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0724/files/7th_grade_math_review_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/49284003714.pdf
    • https://cdn.shopify.com/s/files/1/0434/1606/0061/files/english_to_chinese_language_converter_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/8408/5416/files/exponent_product_rule_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/kurarikufizolot.pdf
    • https://cdn.shopify.com/s/files/1/0430/1016/2837/files/44502258936.pdf
    • https://cdn.shopify.com/s/files/1/0430/7052/1495/files/zogalojimi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006530.bin
d05f92a5bc49200caec74feea5a88ce09a865cda2ef71e704b499688d031b126		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6530 4060 bytes
font_01_sfnt_off0000739b.bin
f054cfdc900cc9766c158ca99eb547cd2f0d790acde5fdfb219344532c515ffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739B 5764 bytes
font_02_sfnt_off0000871d.bin
8fbf933ceaa7c9eee05612751ee2746665fe49b6c3e91ce9ca5e4c6400de01a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871D 12160 bytes

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