Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07464afd35b3f7c…

MALICIOUS

PDF

45.0 KB Created: 2020-08-15 02:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8d15efa31f00fe3a928cd94a94bff03 SHA-1: 630a18091ca4900c7b839a50f8ac5e1404a1743d SHA-256: a07464afd35b3f7cd067d96214c96e26add77241cad0d240b2c2ee682aaa0598
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with many pointing to a link farm hosted on cdn.shopify.com. One of the primary links, https://ttraff.ru/pify?keyword=esri+story+map, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to lure users to malicious content through a link farm.

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=esri+story+map
    • http://files.kunacounselingcenter.com/uploads/1/3/1/6/131606186/masejalefito_womixozotutenuj_guvuvof_zeluxafu.pdf
    • http://lokekutus.moparsunlimited.net/uploads/1/3/0/8/130814124/tediwinolosaxe.pdf
    • http://files.dueweke.net/uploads/1/3/1/3/131379732/48211.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/wafemaxokerimagokifud.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0397/files/bharti_axa_life_insurance_policy_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/nazigoxupuf.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/25390474879.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8342/files/79056689788.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/tuxanefujebaveliwiku.pdf
    • https://cdn.shopify.com/s/files/1/0430/6357/4682/files/derawerotubo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4458/6140/files/ceniza_de_cascarilla_de_arroz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/68958766178.pdf
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/lavadotigazosalivila.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/printable_december_2020_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/wonderlic_scholastic_level_exam.pdf
    • https://cdn.shopify.com/s/files/1/0435/6754/6527/files/pamadogesebonezeme.pdf
    • https://cdn.shopify.com/s/files/1/0434/3798/1852/files/bajaj_boxer_wiring_diagram.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067ab.bin
1787f8e48aa459b611f3f930c9cf34a1bb6080e7700ca859dbd23448cec60db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AB 4556 bytes
font_01_sfnt_off0000771d.bin
0e0266fb7e154b1aacd625ef525af0ef363d293f48dcb349ea1e851915b8d02b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771D 9932 bytes
font_02_sfnt_off00009917.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9917 4324 bytes

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