Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d8feef640e3684…

MALICIOUS

PDF

47.0 KB Created: 2020-08-14 01:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccfaf4dac9173dbe146094c0d6b09155 SHA-1: 7bec3aad4978f3cc5cd3c1bf7aef49f640ef2eb2 SHA-256: 82d8feef640e36843c02f2b12866f2d1652f945d31efeab5c3235124aa6f36bc
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing for a link farm and another for a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=independent+events+worksheet+pdf', which is flagged as malicious. The presence of numerous links to external PDFs, many hosted on Shopify, suggests an attempt to manipulate search engine results or distribute content through a seemingly legitimate platform. No scripts were extracted from this sample.

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.cc/pify?keyword=independent+events+worksheet+pdf
    • http://files.mattypsrailwaypics.com/uploads/1/3/1/1/131164052/jomiripamukal_dusizuruxefo.pdf
    • http://fibumeta.onesailorboutique.com/uploads/1/3/0/8/130874601/tirunuxuvu.pdf
    • http://files.kaileecristina.com/uploads/1/3/1/8/131856430/2126617.pdf
    • https://cdn.shopify.com/s/files/1/0435/3218/9860/files/texas_vehicle_bill_of_sale_template_fillable.pdf
    • https://cdn.shopify.com/s/files/1/0430/9689/9733/files/14627703856.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/83074695026.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/analytical_chemistry_for_technicians_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/vudifilosobezimoxudedisax.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4005/files/chandelier_piano_chord.pdf
    • https://cdn.shopify.com/s/files/1/0430/9096/8729/files/wd_ses_device_usb_device.pdf
    • https://cdn.shopify.com/s/files/1/0429/2621/1238/files/vuvejelatamoligaxulumu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5145/0519/files/93160895369.pdf
    • https://cdn.shopify.com/s/files/1/0431/4936/1314/files/25774503682.pdf
    • https://cdn.shopify.com/s/files/1/0437/2224/4250/files/gabor_filter_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6911/files/24490730855.pdf
    • https://cdn.shopify.com/s/files/1/0429/1775/7095/files/71876107585.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e76.bin
ca4ba420716d425e390ecc9a6727f7298a01341844e461ebcb6d95af30ccfe28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E76 4780 bytes
font_01_sfnt_off00006eb7.bin
3d6235e1e63aee45017af0a1643ba84c5fb3bbb998e08d838dd5b944488a8de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB7 10128 bytes
font_02_sfnt_off00009174.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9174 4324 bytes
font_03_sfnt_off00009f76.bin
0225b9239f0a99df02be9edcdc276db3cd1a68300e4b8e8c15ee7c6aad4317e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F76 3988 bytes

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