Malicious PDF — malware analysis report

Static analysis result for SHA-256 090c0cdb12eb4089…

MALICIOUS

PDF

50.2 KB Created: 2020-08-24 10:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4169fa92e1810d1680df354e3ac201e9 SHA-1: 75691e6f2df8352b518d2fe35413571b9a0bb456 SHA-256: 090c0cdb12eb4089a7bedb265b5918e1c9259cbfdeffdb012f3ccce475871b12
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Aerobic exercise videos free'. The primary malicious URL identified is https://ttraff.ru/pify?keyword=aerobic+exercise+videos++free, which is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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=aerobic+exercise+videos++free
    • http://files.teamempoweringtogether.com/uploads/1/3/2/6/132682787/fajadifisezuv-muwanabokaji-newosalo.pdf
    • http://files.rasaddleclublarkhill.com/uploads/1/3/0/9/130969761/9522621.pdf
    • http://files.rockwellamezchurch.org/uploads/1/3/0/8/130873715/venubijezividamu.pdf
    • http://files.ronthomaswriter.com/uploads/1/3/1/6/131606331/d5c55031070223c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/9040/3737/files/65771366142.pdf
    • https://cdn.shopify.com/s/files/1/0452/4684/0994/files/55605501743.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92702877098.pdf
    • https://cdn.shopify.com/s/files/1/0432/1302/9540/files/mapa_turistico_badajoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/domovexijos.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/wefonutevixoxovegavemuse.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5621/files/duzezeribe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3117/5063/files/xivofegegamewatekilenal.pdf
    • https://cdn.shopify.com/s/files/1/0434/3303/3880/files/tensile_test_astm_e8.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8053/files/atmosphere_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8954/files/water_pollution_information_in_marathi_language_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3725/files/90306800215.pdf
    • https://cdn.shopify.com/s/files/1/0431/8301/4048/files/zowolamexufebuxepasid.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b2b.bin
5ab91e15decc92e82b2ec36303b2b84171b7ba4c2537434641db161fc6334f69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2B 4632 bytes
font_01_sfnt_off00008af9.bin
ef0c2cce4ba4815d6fa1cd23de669a40a89c6938d8dadd2b67060aa3b894d1b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF9 10252 bytes
font_02_sfnt_off0000adfd.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADFD 4324 bytes

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