Malicious PDF — malware analysis report

Static analysis result for SHA-256 617163dfa9d79daa…

MALICIOUS

PDF

36.4 KB Created: 2020-08-10 02:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bec38040d5468b1c69eaa5a15aaca65d SHA-1: 1ba6d824e2c0db574351a3c3f2fa6abdbfd17cc1 SHA-256: 617163dfa9d79daad47c09e85f687d528b4dcc4af0b9490b12173d9086957ffe
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=brisingr+pdf+download+english`, indicating an attempt to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=brisingr+pdf+download+english
    • http://files.studio16salonspa.com/uploads/1/3/1/4/131453021/6795932.pdf
    • http://files.laspinashouses.com/uploads/1/3/0/8/130814601/5aa45f6414792d.pdf
    • http://files.salmochildrenscentre.net/uploads/1/3/0/8/130813548/gamelumife.pdf
    • http://files.thejourneyinternational.org/uploads/1/3/0/7/130739204/e259b3f7ebedd2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7988/4186/files/gebevapapezaxofu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/21583018511.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/articulaciones_sinartrosis.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/jimopasijosenaxugowog.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/zatabadasorulejunitevutub.pdf
    • https://cdn.shopify.com/s/files/1/0437/0743/3125/files/ps3_region_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6566/files/love_live_jp_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2628/files/89758840175.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7192/files/65853964833.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/juvesixedineteraka.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ed6.bin
f2d13f9db6db0c86f94d0956e5986e2ff7d50928402d3187f0bf651c94b389a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED6 5444 bytes
font_01_sfnt_off0000616a.bin
df4f4d4a6cc65f65f04f471e676e6af1e4084d778aad10bd5e553ff6193b28da
pdf-font-stream PDF embedded font (sfnt) at offset 0x616A 10484 bytes