Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a30fce828c5b0f7…

MALICIOUS

PDF

54.0 KB Created: 2020-08-07 21:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c39e8e30a34b45538d6e35617c06790 SHA-1: 1568898dcce3f806423155afebc268edde80ee1e SHA-256: 7a30fce828c5b0f7843b701c3dd569abeb315fc81820f31b5b4f3569da383a66
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it's an 'answer key' and includes a URL that mirrors the malicious redirector. The presence of a remote-support tool lure and a download button heuristic further indicates a malicious intent to trick the user into downloading or interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ldc+answer+key+2020+pdf+parishkar
    • http://files.cigdemslankard.com/uploads/1/3/0/9/130969204/4530681.pdf
    • http://files.bottegabottega.com/uploads/1/3/1/4/131406592/7341762.pdf
    • http://files.uceplus.co.uk/uploads/1/3/2/7/132712326/9d83bb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0437/3748/1365/files/winob.pdf
    • https://cdn.shopify.com/s/files/1/0435/7203/5739/files/fundamentals_of_engineering_economics_3rd_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/oxford_english_for_cambridge_primary_workbook_6.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/dumovopegitu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78549170372.pdf
    • https://cdn.shopify.com/s/files/1/0435/5712/6295/files/pesimemewi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6918/files/99363884366.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1735/files/dubapironitamiropaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7274/files/.pdf
    • https://cdn.shopify.com/s/files/1/0428/6477/1238/files/rasowunurewawipejif.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/92302889043.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061c3.bin
e4fdcccfa13dc54758942c3580298d5b1417b727e276943ef006185db42b27ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C3 5684 bytes
font_01_sfnt_off0000753a.bin
e5a8fa79f4413264df84a7ba33a96ebbead052b110f0da92174b689878e65d8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753A 10224 bytes
font_02_sfnt_off00009857.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9857 16204 bytes
font_03_sfnt_off0000adc1.bin
232e68d4b4f6483e0edb33d04e89a7b0e16221284d2463692cacc24fcfeab9ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADC1 8880 bytes

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