Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fbd19c972d3743…

MALICIOUS

PDF

44.0 KB Created: 2020-08-18 23:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 669f8a42c95dd59b80d39c0c8fc84e8a SHA-1: 715a4b629d2bb14bb8001521735d280f90769307 SHA-256: 16fbd19c972d37435e3ef8125f158e58d380130fe0ebdc37d0da3060b5a73563
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to potentially malicious sites, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary malicious URL identified is ttraff.ru, which is known for redirecting to malicious content. While no scripts were extracted, the structure and heuristics strongly suggest a phishing or redirection attack.

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=dictionary+and+thesaurus+worksheets+pdf
    • http://files.modernvoguephotography.com/uploads/1/3/1/3/131380546/a45ddd565.pdf
    • http://files.brittanysloan.com/uploads/1/3/2/7/132712332/4024648.pdf
    • http://files.silverlake-designs.com/uploads/1/3/1/4/131437307/falopexutow.pdf
    • http://movupof.lakewoodfencing.org/uploads/1/3/0/7/130739061/lugilenadewo_beludovomovazu.pdf
    • http://files.600bst.com/uploads/1/3/2/6/132681694/xuxaf-dulusovigi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/3420/5590/files/patijitoveginojopunilewu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2112/2211/files/11408782695.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/how_to_hack_quizlet_gravity.pdf
    • https://cdn.shopify.com/s/files/1/0433/1061/2635/files/kawunud.pdf
    • https://cdn.shopify.com/s/files/1/0428/6801/5260/files/wavejuxedekoruwoxobibi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/cantos_catolicos_letra_y_acordes.pdf
    • https://cdn.shopify.com/s/files/1/0437/5235/8049/files/bluetooth_remote_controlled_car.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/after_the_love_has_gone_lead_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/2997/8526/files/takeboxoxalusoxafefudoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0761/files/69792583368.pdf
    • https://cdn.shopify.com/s/files/1/0430/3686/8762/files/16076284115.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006001.bin
d53723018a5ca1660f227eb454c59f76a46defb7525d08f520c927b0354f9a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6001 5352 bytes
font_01_sfnt_off0000723f.bin
18ed09e519ada110acc00964d436c7dab8d26d9e2a8ba49e87f74189968a7266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723F 10112 bytes
font_02_sfnt_off000094cf.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94CF 4324 bytes

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