Malicious PDF — malware analysis report

Static analysis result for SHA-256 221251632872917c…

MALICIOUS

PDF

42.2 KB Created: 2020-08-25 16:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35c11299af1afcfda58b1de2e7d2bfe2 SHA-1: 8a18066d50fed657ed032d635a1e0131de7af253 SHA-256: 221251632872917cc412d5488b6b92360edde63968e9f9957c8bab8570dbbaa7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with the primary malicious link pointing to a redirector. The heuristic firings indicate this PDF is part of a link farm, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious nature of this document.

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=peruvian+leaf+mantis+care+sheet
    • http://sewazo.mlabnj.com/uploads/1/3/1/4/131437619/lutudobote-muvasud-vujuranekatam.pdf
    • http://files.hairlabandbeautysalon.co.uk/uploads/1/3/0/7/130775014/c8b54a.pdf
    • http://files.sfcnewhire.com/uploads/1/3/0/7/130776120/xabuvedo_rigiwobap_labozimupufor.pdf
    • http://zuresapi.advancedanaerobics.com/uploads/1/3/1/3/131383483/rawesatubi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/lewakugoxar.pdf
    • https://cdn.shopify.com/s/files/1/0429/4872/2851/files/fobuzekolijojil.pdf
    • https://cdn.shopify.com/s/files/1/0432/1994/3579/files/78609314240.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/bemarefovug.pdf
    • https://cdn.shopify.com/s/files/1/0447/4172/2263/files/preparation_of_alkyl_halide.pdf
    • https://cdn.shopify.com/s/files/1/0437/5596/2522/files/fesumafosul.pdf
    • https://cdn.shopify.com/s/files/1/0431/9477/7760/files/64069561803.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/marurelek.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3982/files/physiology_of_pulmonary_circulation.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/union_budget_2020_19_bankers_adda.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/45150113401.pdf
    • https://cdn.shopify.com/s/files/1/0432/6588/4323/files/87478708826.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7185/files/ps_form_2976-_r.pdf
    • https://cdn.shopify.com/s/files/1/0431/0967/9265/files/29813900804.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_off000067b3.bin
9118e16ca3ad793cea6585dcf924a25a720cb98e1a4b3783f355394f053f3bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B3 5180 bytes
font_01_sfnt_off00007927.bin
d68ee0fee2008008037d153a432ad13a9785b6c5fa521782f0d923eb292bd483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7927 10196 bytes

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