Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1530c94b919325…

MALICIOUS

PDF

39.9 KB Created: 2020-09-02 00:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99c058e09c2ec6d4fcd8d8450fa44aa5 SHA-1: 94dcea332fe16941028dacfdf5d6bd692671587e SHA-256: 7b1530c94b91932544b2308e411b3e5ce99686eeacd2a575501e79db6e229e3f
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as a search result for 'celebrate recovery lesson 22 answers'. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to host numerous external links, likely for SEO manipulation or to distribute further payloads. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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/wix?keyword=celebrate+recovery+lesson+22+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9317/9030/files/ncvt_mis_exam_date_sheet_2019.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5317/files/19801828130.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/tratamiento_del_cancer_gastrico.pdf
    • https://cdn.shopify.com/s/files/1/0432/2993/7832/files/eminem_agent_contact_information.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/98172569798.pdf
    • https://static.usrfiles.com/ugd/8ade13_c7877c1f5d104a0e88065344474f14d7.pdf
    • https://static.usrfiles.com/ugd/b6aaa0_3f0b64fbea724101915a23749cadd3e4.pdf
    • https://static.usrfiles.com/ugd/97368a_60dc2cfafd334b9d945d223e91580564.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b57079a03574ee384b79c52a839f77f.pdf
    • https://static.usrfiles.com/ugd/362633_4c4471d5dd694674a44b327024294452.pdf
    • https://static.usrfiles.com/ugd/7603ae_ac044d5737434daa97a8401de97c1d11.pdf
    • https://static.usrfiles.com/ugd/b8c837_754bab15c0f4436c80791f3e2f1a7b2b.pdf
    • https://cdn.shopify.com/s/files/1/0429/6998/9279/files/36089601219.pdf
    • https://cdn.shopify.com/s/files/1/0437/5596/2522/files/dakamobesu.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_off00005cff.bin
9509b10a57d0013915478cbd13115068482a7f1c72a4c32bc327f03840ff58cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFF 5224 bytes
font_01_sfnt_off00006ee8.bin
942f56ab33a7999372af5dd295aac31b81708b3dbfd1988f19cf995df3c6d46e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE8 10752 bytes