Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1dbc34bc37a83c…

MALICIOUS

PDF

41.5 KB Created: 2020-08-21 15:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3ef1ac74abe95098bf16f8164736cd4 SHA-1: fa26b35b87aa0444cf7bded038435d6581224e57 SHA-256: dd1dbc34bc37a83c2de6ec6a338e6cffba99fbc4fe91443f034dbf72e0d9e8d4
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, forming a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious destination. The document body, though heavily obfuscated, contains the same search query as the malicious redirector URL, indicating a lure to a phishing or scam page.

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=lie+nielsen+honing+guide+worth+it
    • http://gawudexu.jeannepanek.com/uploads/1/3/0/9/130968917/zemonuvobapov-mezedogi.pdf
    • http://nuxumuvir.babyg-lash.com/uploads/1/3/0/7/130775583/1617803.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/wurefanamufawedefivad.pdf
    • https://cdn.shopify.com/s/files/1/0433/7847/5162/files/pagifosujejej.pdf
    • https://cdn.shopify.com/s/files/1/0431/3602/4742/files/54106634294.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/lumodi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3637/6231/files/webuxurasijow.pdf
    • https://cdn.shopify.com/s/files/1/0433/1811/6510/files/daviwefapexemuwoso.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/java_swing_and_awt_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/duvujomosakepesubomimu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/windows_10_enterprise_latest_iso_direct.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2559/files/consumer_reports_best_laptops_2017.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3961/files/58767155638.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_off00006373.bin
9ba63eaddf6c31d71dec88ec180084a6704dc71aec0c2ba0abb75d76eb2541ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x6373 4908 bytes
font_01_sfnt_off00007431.bin
6249bddbcb5b706688c23a0f73b55aec80b7d25411c8b79ea497f9aae3279ea4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7431 10796 bytes