Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c844d5c69de988d…

MALICIOUS

PDF

55.2 KB Created: 2020-08-24 21:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18d77dbfd9a1c47b855c878a8ee0e504 SHA-1: b2e201cc9c1742e616b7abe218256119f0b76f6d SHA-256: 1c844d5c69de988d68ee2e18ab017bbd0ee0714bc6b867aa228f4e3a7fec871d
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to contain the URL 'https://ttraff.ru/pify?keyword=aaye+din+bahar+ke+songs+pk', which is flagged as malicious. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=aaye+din+bahar+ke+songs+pk
    • http://godikalif.rodandgunclubofnewbedford.org/uploads/1/3/1/3/131379591/6f1b1dd41798c1.pdf
    • http://files.cafedatalkalamode.com/uploads/1/3/1/4/131483550/3bbbf7.pdf
    • https://cdn.shopify.com/s/files/1/0449/0254/7611/files/programa_agita_sao_paulo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4632/files/sesokinelebovipifedubev.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/chrome_plugins_on_android.pdf
    • https://cdn.shopify.com/s/files/1/0439/4939/2030/files/cross_multiplication_method_examples_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/4836/0343/files/su_kasidesi_erhi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6983/1323/files/jarajabasozezogagogikove.pdf
    • https://cdn.shopify.com/s/files/1/0431/1157/9809/files/beef_liver_recipes.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_off00008fdf.bin
966bdd54e8ab9f8ec7dbf8f5c9d6c6e2d8d246a39d3ae6022ea211e9dd5ad021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDF 5484 bytes
font_01_sfnt_off0000a27c.bin
7698e8b598efbc25cfea1521f9f59fcf193ede11a304a6b67ee0102062f91a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA27C 14804 bytes

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