Malicious PDF — malware analysis report

Static analysis result for SHA-256 f617c31000f141ae…

MALICIOUS

PDF

40.1 KB Created: 2020-08-20 04:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a87b5c7d5ed72b60b617dd9bd904fd9b SHA-1: 05ea922019deda886d651c7c0cfab29256f12689 SHA-256: f617c31000f141aeda0159dacfac5d70d4e9ab27e82ae470084ba9ebff59fac8
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) or are hosted on domains that appear to be part of a link farm. The document body, though partially corrupted, suggests a lure related to 'harmonic sequence problems with answers', likely intended to trick users into clicking the malicious links. The ML classifier strongly indicates maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of links to known malicious infrastructure.

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.ru/pify?keyword=harmonic+sequence+problems+with+answers
    • http://files.firetailers.com/uploads/1/3/1/4/131483154/tanute.pdf
    • http://files.jonathanstoney.com/uploads/1/3/1/3/131380308/559ff8f5.pdf
    • http://fobera.stjohnlutheran-drake.com/uploads/1/3/1/4/131453870/c0ded0a810.pdf
    • http://files.performaxbunbury.com/uploads/1/3/0/7/130776407/5057878.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/69556709185.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/zageze.pdf
    • https://cdn.shopify.com/s/files/1/0438/1212/6882/files/zovopinilap.pdf
    • https://cdn.shopify.com/s/files/1/0429/9600/7065/files/24486075282.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/15498183267.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4008/files/66687932824.pdf
    • https://cdn.shopify.com/s/files/1/0438/4548/4706/files/mowoxapenu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3938/1912/files/definition_of_commencement.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/26345227889.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_off00005bb0.bin
bc549b44e6dd229db3549a7421b28b7d161efa007219abe4f7002b41679cabbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB0 5492 bytes
font_01_sfnt_off00006e38.bin
e268abfe3ac8351550ad126594862ed0d807b7b0c61df32ffc5ee831a889e072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E38 11536 bytes

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