Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fded9599df53ad…

MALICIOUS

PDF

38.7 KB Created: 2020-08-14 10:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2317d95507dd4853617b73ef2d64cb94 SHA-1: 2e03c9252e1279975f71c8c4e8389828a17f3f3b SHA-256: a5fded9599df53adee7512e3af81ef09fa6669721a061053cfcea884de84a589
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though garbled, contains text related to 'Carrie Underwood look at me sheet music' and a URL that appears to be part of a link farm designed to attract traffic. The ML classifier strongly indicated maliciousness, and the presence of a redirector link suggests an attempt to lead the user to a malicious site.

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.com/pify?keyword=carrie+underwood+look+at+me+sheet+music
    • http://files.treasuresofthehudsonhighlands.com/uploads/1/3/0/7/130775205/muxori.pdf
    • http://ximakuwi.pitchesbecrazy.org/uploads/1/3/0/9/130969060/mivaxalanewi_fodemapu.pdf
    • http://files.icecoldcrime.com/uploads/1/3/0/9/130969477/talolugosan-zukaxavunoduko-megugeg.pdf
    • http://files.wildridecreations.com/uploads/1/3/0/7/130740298/rojazezidobixar-golesojave-karul.pdf
    • http://maniw.montserratcolome.com/uploads/1/3/0/7/130776407/mused.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/wirorukelevivateruzogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/povovinuduseze.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2166/files/black_and_decker_mouse_sanding_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/kukitabezeje.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/61451986607.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/tifijowigewo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4426/6399/files/dusijod.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/63272105713.pdf
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/vekubugotabogovasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/95847995652.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/piwabemisagaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3511/5176/files/87309490100.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/salvation_army_valuation_guide.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/1/0432/6942/3269/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005876.bin
f72597736aca833aaf4d1167f11a66746e172be3fb5b905bead552b8f06a06e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5876 5240 bytes
font_01_sfnt_off00006a2c.bin
e88525d7d846f19ee6f773344d7fc62ea6f469f7f4254cb64efa650c1b215645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2C 10308 bytes

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