Malicious PDF — malware analysis report

Static analysis result for SHA-256 d539fb5ecf08d445…

MALICIOUS

PDF

42.7 KB Created: 2020-09-01 02:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e578e4d3573cf36d0e0e5108027e917 SHA-1: a1bd30bca502de0e799c2d237c1ceed8340adcc0 SHA-256: d539fb5ecf08d4451b28d9f1b53c7044266e42ce2e3ee5dd47b6bf6bc9852a93
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a search result for 'Google assistant apk for kitkat no root'. The document also features a large number of embedded links, many pointing to Shopify domains, which is characteristic of SEO link farm techniques used to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=google+assistant+apk+for+kitkat+no+root
    • https://static.usrfiles.com/ugd/f3cb45_af6f004e157348f7985e8ec9dfa0f381.pdf
    • https://static.usrfiles.com/ugd/89064d_922711fc112746e8a6e20cee92c6259e.pdf
    • https://static.usrfiles.com/ugd/6da380_15de9fdb388046718ce487ace7402803.pdf
    • https://cdn.shopify.com/s/files/1/0431/4156/2522/files/12053363918.pdf
    • https://cdn.shopify.com/s/files/1/0430/6472/1562/files/ctet_syllabus_2019.pdf
    • https://cdn.shopify.com/s/files/1/0437/1369/1799/files/black_hole_temperature.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/100_best_loved_poems.pdf
    • https://cdn.shopify.com/s/files/1/0434/1311/0951/files/93396808150.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/nesuwafixopufibimimo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/50883655927.pdf
    • https://cdn.shopify.com/s/files/1/0436/0326/3645/files/arabic_font_illustrator.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/gaboxizawejibopilajiper.pdf
    • https://cdn.shopify.com/s/files/1/0435/3697/3975/files/can_i_be_him_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/1404/5341/files/91383900115.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069e7.bin
5816da4d0a281fa5c4ea0840ef4fe99b0b19ebe76eea2549fd77e9da42df2943		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E7 5164 bytes
font_01_sfnt_off00007b97.bin
e87f78d001782d626d926e152efe6b3dee10021fe7b96d40dd32820bf2aa472c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B97 9932 bytes

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