Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e8fba16fc1e04c…

MALICIOUS

PDF

115.1 KB Created: 2020-08-08 09:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da04c7f439fc553028457b204bcfddd6 SHA-1: aaaf0532608c8de66d94dc6d0f0edbcd3af333e2 SHA-256: 54e8fba16fc1e04c40cde80096747ea524f4355237b4bb901d424a6428c16cd6
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.com/pify?keyword=yeni+askerlik+sistemi+maddeleri+pdf'. This URL is presented to the user as information regarding a new military service system, likely as a lure. The PDF also contains a mass external PDF link farm, with many links hosted on cdn.shopify.com, suggesting an attempt to distribute content or evade detection. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=yeni+askerlik+sistemi+maddeleri+pdf
    • http://files.nhbluebook.com/uploads/1/3/0/8/130873947/gomude_dubilu_vibukexuriweno_xizowolozutogi.pdf
    • http://files.madebyhollie.com/uploads/1/3/2/8/132816036/zipisuvudixilep_wenupikenuzef_mazof_warixemevi.pdf
    • http://files.ims-spi.com/uploads/1/3/0/8/130874205/fdb40bd7371.pdf
    • http://files.pocketchangetexas.com/uploads/1/3/1/3/131380042/471a7.pdf
    • https://cdn.shopify.com/s/files/1/0429/5163/9196/files/71353346804.pdf
    • https://cdn.shopify.com/s/files/1/0430/2854/5693/files/xilotovijoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/ronavezalijepakitaremus.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/lopodewizowelokoru.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8985/files/vuzokibebaviroz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9475/files/basic_electronics_mcqs.pdf
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/92357530839.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/aprender_coreano_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/xitabej.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/fidesisoraxetinokixog.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/57517412869.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3584/files/asterix_in_britain.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2715/files/xofutijixiriwuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/between_and_among_exercises.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_off00018318.bin
56dd757174d38a8487919eff152bc86f4069a6c0f5d41404947d7665e8dd483c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18318 5212 bytes
font_01_sfnt_off000194be.bin
f95b4793f93326fcf7453b0d03f92db82858033b248000abbccac48644447ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x194BE 13196 bytes

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