Malicious PDF — malware analysis report

Static analysis result for SHA-256 802e87dd113815eb…

MALICIOUS

PDF

81.5 KB Created: 2020-08-26 12:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a428339990bdcefcada1dc4df5c6fe9 SHA-1: 9e0ea9bf0c492a09df6bebce39a0c2c3ed1186a9 SHA-256: 802e87dd113815eb78d813a34f3790d11a6fed8269276e04605b02161047348f
154 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing numerous external links, many of which point to other PDF documents. One prominent link, 'https://ttraff.ru/pify?keyword=cogs+160+ucsd', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure suggests an attempt to distribute or redirect to malicious content, possibly for SEO manipulation or malware delivery.

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=cogs+160+ucsd
    • http://potem.rsyc-indiana.org/uploads/1/3/0/7/130739723/pasururepi-duwodewovav.pdf
    • http://getosa.wekeepyoumotivated.com/uploads/1/3/0/7/130739287/6037708.pdf
    • http://files.newenglandinjectors.com/uploads/1/3/0/7/130775565/498990.pdf
    • http://jalisix.ocbadminton.org/uploads/1/3/2/3/132303317/4e0a831.pdf
    • http://kidotuz.artbyaiste.com/uploads/1/3/0/8/130814124/1040514.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/20244842676.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/visetosu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3658/0759/files/362157335.pdf
    • https://cdn.shopify.com/s/files/1/0434/0377/2056/files/fuwojavibomiwup.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/95768109197.pdf
    • https://cdn.shopify.com/s/files/1/0438/3942/2626/files/souncloud_to_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2630/files/ancient_history_questions_for_upsc_prelims.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/20780360318.pdf
    • https://cdn.shopify.com/s/files/1/0433/6215/6702/files/78326066182.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3502/files/bundeslnder_wappen.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_off0000ee0d.bin
df404b91e3642ed5413d70d724fa28983a279d253e2d1079b2a6b5f60295b2e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0D 4672 bytes
font_01_sfnt_off0000fdf4.bin
33c681c342878097c5b2b0dc4b740ce787b4c0e45b579cecc09a27175111c72c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 13816 bytes
font_02_sfnt_off0001296c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1296C 4324 bytes

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