Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fda45e6b8fed499…

MALICIOUS

PDF

45.9 KB Created: 2020-08-31 17:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37c97092ebd5ee479462ac790b44c219 SHA-1: 205bcd73db9a46f7276da26dab8c1bd44897ba52 SHA-256: 1fda45e6b8fed499452bb0b8cb643f2e6155da26272c2baa71314e2777b47743
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=manual+ar+condicionado+portatil+pinguino+pac+c105'. This indicates the document's primary purpose is to lure users to a potentially harmful site. The presence of a large number of external PDF links, many hosted on Shopify and static.usrfiles.com, suggests a link farm or SEO poisoning tactic to improve the redirector's visibility. No scripts were extracted, but the embedded URLs and the malicious redirector are sufficient indicators of malicious intent.

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=manual+ar+condicionado+portatil+pinguino+pac+c105
    • https://cdn.shopify.com/s/files/1/0454/1464/5928/files/behavioral_neuroscience_8th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6007/files/69924573626.pdf
    • https://cdn.shopify.com/s/files/1/0428/7099/7151/files/74231126741.pdf
    • https://static.usrfiles.com/ugd/b8c837_40427c1de91b472eb12c545b3c415cf4.pdf
    • https://static.usrfiles.com/ugd/dd4472_8058de88f9884bf38f036b942b764015.pdf
    • https://static.usrfiles.com/ugd/a4e402_621f693175ab4ac7a6e4c680b587250d.pdf
    • https://static.usrfiles.com/ugd/b8c837_577d03c2bc6a44589703ca04f8528cd5.pdf
    • https://static.usrfiles.com/ugd/8de238_ade707d23e4f492ba01da48f275f4f8e.pdf
    • https://static.usrfiles.com/ugd/824332_7c551bb6ca9a4db58b27e26886a2c4b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_0425a56518024801944dc1c0f3b7465b.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_08ad4c48d87f4202b7690105b14d721d.pdf
    • https://static.usrfiles.com/ugd/e643da_f155b2001c7448768852624099d19628.pdf
    • https://cdn.shopify.com/s/files/1/0427/7937/7830/files/84167248861.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/zijewejagumurogedowux.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/zigoku.pdf
    • https://cdn.shopify.com/s/files/1/0433/9610/4348/files/vamiluzuzufugipapef.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_off00005856.bin
84124cee3e02ee82b24763143b883d804db153b872bbe0b69175b674f6875409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5856 5152 bytes
font_01_sfnt_off000069e0.bin
c5dcb3876622c7ed969c94a12f21f8d5399d92e1b7a25c65cd80786a19268023		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E0 16596 bytes
font_02_sfnt_off00009c70.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C70 4324 bytes

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