Malicious PDF — malware analysis report

Static analysis result for SHA-256 37686425c85802ac…

MALICIOUS

PDF

45.8 KB Created: 2020-08-23 14:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfab95116b75301ba38e42d66ecc2f5b SHA-1: b051d5b21382c3bf9c50ca71266a321b07c1b0e6 SHA-256: 37686425c85802ac2e97e944f453145be9cc1eb9a5df83bddce976c643d456d4
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with the primary redirector URL being https://ttraff.ru/pify?keyword=examining+digit+place+value+common+core+sheets. This URL is flagged as malicious and likely serves to obscure the true destination of the attack, which is probably phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=examining+digit+place+value+common+core+sheets
    • http://files.fhucc.org/uploads/1/3/1/3/131379343/jabanimotofa-gupidogeje.pdf
    • http://files.saintjosephsculturalcenter.org/uploads/1/3/1/8/131871568/3cb3d.pdf
    • http://files.lincolncommunityleague.org/uploads/1/3/0/9/130969966/2988f9962e64.pdf
    • http://katedibe.circlekmfg.com/uploads/1/3/1/8/131872096/vumuzesawulafuzop.pdf
    • https://cdn.shopify.com/s/files/1/0440/0162/4214/files/89418039229.pdf
    • https://cdn.shopify.com/s/files/1/0447/9077/5965/files/ctet_syllabus_december_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4724/7263/files/56682294800.pdf
    • https://cdn.shopify.com/s/files/1/0428/3973/6487/files/family_tree_maker_ancestry_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5291/files/window_on_scroll.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7872/files/98235355818.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/pujafimebowaluzezedes.pdf
    • https://cdn.shopify.com/s/files/1/0435/0840/0280/files/java_code_snippet.pdf
    • https://cdn.shopify.com/s/files/1/0435/3232/0917/files/char_broil_performance_650_gas_grill.pdf
    • https://cdn.shopify.com/s/files/1/0433/3332/0872/files/tuxuja.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6901/files/61487530097.pdf
    • https://cdn.shopify.com/s/files/1/0430/0193/8079/files/thyristor_triggering_circuit.pdf
    • https://cdn.shopify.com/s/files/1/0429/0219/2284/files/qu_significa_languidez_en_espaol.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048ba.bin
9e33f4bc8fba68d9df3f5eea96e49843bd7ea11ae98361fdd6f623e3af68defb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48BA 5452 bytes
font_01_sfnt_off00005b0f.bin
56f9fb540e7e5657ca6fab4e7ef541bdf9a30eefbef2b54e1ac577addb6899d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0F 1704 bytes
font_02_sfnt_off0000638d.bin
b2e6b1c6400ea1211044a2b75abc2bf2853aee809bbfffb397ab5531b4e20402		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638D 9816 bytes
font_03_sfnt_off0000853d.bin
914d2cae971dfc66734b5226dcb678567ddefc4f1632daa5766068cbdb0cb52a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x853D 16268 bytes
font_04_sfnt_off00009ac2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC2 4324 bytes

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