Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0639994f0294da…

MALICIOUS

PDF

50.5 KB Created: 2020-08-12 08:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1281f5c73c20ce6fbae22477e8016cc5 SHA-1: 367ef8d116ed7f6ff8ce135a66eb8d5632801da7 SHA-256: af0639994f0294daa12d3201bace5fc8dd2541375282d274ce4bd1ff1eb3bcf8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, indicating a social engineering attempt to drive traffic to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=cavatine+trombone+pdf. 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=cavatine+trombone+pdf
    • http://files.thinkwiththem.com/uploads/1/3/0/8/130813612/tuxari-webejidadudula-dunabet-juwolu.pdf
    • http://files.yashbangera.com/uploads/1/3/0/7/130738625/83486b04a35.pdf
    • http://files.blackngreenphd.org/uploads/1/3/1/3/131380688/sajijomulele-lafug-dagafevemope.pdf
    • https://cdn.shopify.com/s/files/1/0438/5826/4229/files/bicsi_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6869/files/jackie_chan_filmography.pdf
    • https://cdn.shopify.com/s/files/1/0448/4333/5837/files/hemodialysis_catheter_infection.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/42714879415.pdf
    • https://cdn.shopify.com/s/files/1/0429/0481/3721/files/97209503824.pdf
    • https://cdn.shopify.com/s/files/1/0431/5761/8850/files/taiho_engine_bearing_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0440/4084/7510/files/zupisuxeloxozekamowezilas.pdf
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/wanemituso.pdf
    • https://cdn.shopify.com/s/files/1/0440/0214/8510/files/security_plus_study_guides.pdf
    • https://cdn.shopify.com/s/files/1/0433/6068/2139/files/blank_world_map_continents_and_oceans.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37357510366.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/
    • https://cdn.shopify.com/s/files/1/0431/5761/8850/files/taiho_engine_be

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007378.bin
874e18af8a239b4123a0481987a8d3dbf3643cef27f7c1ff13697c2368845a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7378 5080 bytes
font_01_sfnt_off000084a2.bin
c70ca17135de22ae0d1973d0410dc23271445792e2c3700d6a5d224103cfad63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A2 10204 bytes
font_02_sfnt_off0000a7c1.bin
fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C1 16120 bytes

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