Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb7cdbbe7b67d9f…

MALICIOUS

PDF

46.3 KB Created: 2020-08-12 08:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ae5d89de481fef0a0afcdc104d2ab93 SHA-1: 3fdbca503ba7a0ea3efd20c858cacb82123b87be SHA-256: eeb7cdbbe7b67d9fcdc8d3b365afe2e8e70425c1a66adee84c30907a48196ea0
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, with the primary link pointing to a redirector service (ttraff.ru) that likely obscures the final malicious destination. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and contains no readable content, but the presence of numerous links, including a known malicious redirector, suggests 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=apraxia+of+speech+test+pdf
    • http://files.decgallery.com/uploads/1/3/1/3/131384789/cc8b20d.pdf
    • http://files.stylistmatter.com/uploads/1/3/2/6/132695575/90e0e0fa6d2a.pdf
    • http://loxugug.corpuschristievansville.org/uploads/1/3/2/7/132740873/643813.pdf
    • http://files.silkroadcarpets.com/uploads/1/3/0/7/130776126/dutupedepekunepi.pdf
    • http://bufitapo.jacksonwritereditor.com/uploads/1/3/1/4/131453041/dukedidaw_dosupi_riwuxodetog_lupavoxidivufig.pdf
    • https://cdn.shopify.com/s/files/1/0429/1664/2975/files/26332725.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/59114547616.pdf
    • https://cdn.shopify.com/s/files/1/0439/0069/8792/files/2004_lexus_rx330_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/afrontamiento_ineficaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8534/8508/files/366358881.pdf
    • https://cdn.shopify.com/s/files/1/0436/9452/2523/files/personal_anecdote_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/52109477369.pdf
    • https://cdn.shopify.com/s/files/1/0431/2986/4343/files/41974392810.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/78204551163.pdf
    • https://cdn.shopify.com/s/files/1/0438/4718/8640/files/22487435738.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/kumav.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3667/files/basic_knowledge_of_computer_applications.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_off0000617e.bin
7dba7b50852a5cf62b37f1559093c3cab49b83b6de9381b7b89a20ea543cded9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x617E 5268 bytes
font_01_sfnt_off00007360.bin
50eaa4604510af7c52177085205529aadcbb1172b581bc153ce062ee4855007a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7360 10288 bytes
font_02_sfnt_off000096af.bin
68eef4b610644b6a98f668349b58b424e8310755c20c018328a8321db0e17a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96AF 16232 bytes

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