Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b1451b8dfc7bbc…

MALICIOUS

PDF

48.0 KB Created: 2020-08-08 00:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9af308f9ae57d82dd0d19e9588a4ac59 SHA-1: 53b1aca982c389771e9d15b2aeacb4ea9459d784 SHA-256: 17b1451b8dfc7bbc05c4343377a4c1a6d529f4f3e914aa3810dfaeef7276cc12
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of numerous links suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution.

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=tsc+appraisal+form+pdf
    • http://files.bubbleytrinkets.com/uploads/1/3/0/7/130738823/2e674f4ea19c4e.pdf
    • http://ludame.hauntedmichigan.net/uploads/1/3/0/7/130738970/1d7f33.pdf
    • http://files.newlifedirectionsministries.com/uploads/1/3/1/6/131607404/jibexibuxevu.pdf
    • http://files.thehammam.org/uploads/1/3/0/7/130775405/todavog_dipagid_pezes.pdf
    • http://files.vcaec.org/uploads/1/3/1/8/131858287/141951.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/medal_of_honor_airborne_patch_v1._1.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/80476350168.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/51829520878.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/gudejebexu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9762/files/10505444398.pdf
    • https://cdn.shopify.com/s/files/1/0432/2479/3245/files/duzobexiledixebod.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6262/files/luxixikedopikerazato.pdf
    • https://cdn.shopify.com/s/files/1/0430/2517/0595/files/18457147000.pdf
    • https://cdn.shopify.com/s/files/1/0432/9144/3364/files/teenage_story_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/9952/1181/files/negaxiwijibizaju.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/dusewalesidovoxez.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/24962208616.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/jumodewenodinebomubikej.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_off00007026.bin
6d75452d9977d5d8de98afee9d1c8e570c7db1420c14629b68b9da4aaac1d599		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7026 4736 bytes
font_01_sfnt_off0000802b.bin
d74cdb58712dfe837b32821f8fbba1b093e346472e713886d3aaaedd1ab2fd8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802B 10596 bytes
font_02_sfnt_off0000a440.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA440 4324 bytes

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