Malicious PDF — malware analysis report

Static analysis result for SHA-256 72811053551a78a2…

MALICIOUS

PDF

98.0 KB Created: 2020-08-14 01:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6275bfab1a0a68c0a715f4351bf654f1 SHA-1: 1bce936c4fb7d9c522235ce1c3089fd7d974fd59 SHA-256: 72811053551a78a2824f358ccfcac02656732179a2929a6dadbdd8a37010b379
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains numerous links to external resources, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a game mod download, aligning with the 'Advance-fee Scam' heuristic. The presence of many PDF links suggests a link farm, likely to obscure the malicious redirector.

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.com/pify?keyword=castlestorm+mod+apk+1.+78
    • http://pulir.cancersurvivalwhatsnext.com/uploads/1/3/1/4/131454065/9559100.pdf
    • http://kegolo.tuvalucoffeehouse.com/uploads/1/3/1/4/131453133/daxenobijibam-gazanawamib-lajuro.pdf
    • http://jagurimu.mindfulmomentsbook.com/uploads/1/3/0/9/130969352/be58ab2ff6a.pdf
    • http://files.taskgirlbayarea.com/uploads/1/3/2/3/132303081/nutubexeweg_tebibok.pdf
    • http://////HandyGamesSubscribe
    • http://////////-HandyGamesSubscribe
    • http://////////HandyGamesSubscribe
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/affinity_publisher_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1555/files/suduvafafi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7675/4344/files/fatujefefoloturefajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3635/files/solidworks_tutorial_11.pdf
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/32700244022.pdf
    • https://cdn.shopify.com/s/files/1/0432/6113/2962/files/16520228895.pdf
    • https://cdn.shopify.com/s/files/1/0451/6475/7146/files/carmina_burana_choral_score.pdf
    • https://cdn.shopify.com/s/files/1/0440/7682/6789/files/accounting_for_partnership_basic_concepts.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/47732173093.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/18600808797.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4158/files/57427545643.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/95723263798.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17232613021.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_off00011359.bin
d31655ad5744fc5ec80ab8dd214f41f46bd0bf058418a1c04896d33658b2fbd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 6192 bytes
font_01_sfnt_off000128b6.bin
d8e343d52c95bd3dae1f22e7f5407d207cfe1a6b5f501b07eea6c3060da69b5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128B6 5432 bytes
font_02_sfnt_off00013b26.bin
0698dd01587948c160e5175dfcd4942e9c611dff1cf45c9ec1f8c78387e2940b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B26 11712 bytes
font_03_sfnt_off00016304.bin
a3ce7996c0d9e84fe531dde36bd286e2783d587b2166d8a1c9ab6178b19825f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16304 16564 bytes

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