Malicious PDF — malware analysis report

Static analysis result for SHA-256 91aed389e6b64a7f…

MALICIOUS

PDF

92.6 KB Created: 2020-08-08 14:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9414d68a37915bf80b018fd057af06a SHA-1: fc1c3052b99538e1b885414da175426743b39858 SHA-256: 91aed389e6b64a7f0b10049143d46823def762f840f6b61880152f5b365ab2ab
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a tactic to manipulate search engine results or to redirect users to malicious content under the guise of providing physics equations. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=physics+equations+of+motion+pdf In PDF document text
    • http://files.factorfakedfan.com/uploads/1/3/0/9/130969572/vojuriwusomoparut.pdfIn PDF document text
    • http://nanamejuj.acornequalityfund.org/uploads/1/3/1/0/131070493/74947.pdfIn PDF document text
    • http://files.greenmarkdairy.com/uploads/1/3/2/8/132816036/6965367.pdfIn PDF document text
    • http://files.havadoula.com/uploads/1/3/1/3/131382387/1254833.pdfIn PDF document text
    • http://files.wichitasouth77.com/uploads/1/3/0/8/130815277/6768741.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7602/5501/files/83396531656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunazazaxukatokezidabu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0758/2106/files/21426155294.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/tutawim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/4128/1432/files/idot_511_iowa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3967/7855/files/modumedisomode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5541/5445/files/berlin_underground_map_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/gigidofejofinitukanabel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5211/3820/files/chemical_principles_zumdahl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9887/3762/files/fegozisiko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1373/4563/files/mironamaxupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/gijakademopori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7401/9740/files/70851207767.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f687.bin
19817d47c53379199c63a81470abff0a0f0c6ff5d7da191a308eb1f4147bac6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 5376 bytes
font_01_sfnt_off000108a3.bin
afae0d65020ba943760bd7a5d64c6ed90b73ba5a0440f59aba830210536a4f98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 18204 bytes
font_02_sfnt_off0001412d.bin
5e79e8f97975fa1339f9da354fb372a17275c3d7829de0a18f77683f03fae4b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1412D 16172 bytes
font_03_sfnt_off00015656.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15656 4324 bytes

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