Malicious PDF — malware analysis report

Static analysis result for SHA-256 900a81b81b769817…

MALICIOUS

PDF

36.5 KB Created: 2020-08-31 06:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7c2acdebc0ca5da0ead773fffd762da8 SHA-1: 414b468ab43bfb4ecad1902a8ee5ece3f371dfb9 SHA-256: 900a81b81b76981701d977c53a1377abb0fdb10e8df94de4c74ad0b063915dd6
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, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to 'latest telugu songs' and includes the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic.

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.me/wix?keyword=doregama+latest+telugu+songs In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/1fa6dd_d0f8cb89f9484cbe80c125f3d2f1ee3e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_b47872eb1fc74acd89e7d333ae2f581c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f3ecbe_f0bdbc820c3c40c2a92313f109e3ffb9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5857/7064/files/69970854535.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/1858/7033/files/bekalugudiwelelakuburifa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0896/4246/files/46838284307.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d5415a_f95b0076de474bb4afe8cba7c8092336.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/067ecb_4afbfea2c94f44b9a398c3929f96b4be.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a4d998_39044f8175e94986a4f7e900b5dfffaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/1715/4208/files/transgenerational_epigenetic_inheritance.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5981/3279/files/kibemupus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/gasivatasuput.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9721/7440/files/cracking_the_code.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000521f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x521F 5004 bytes
SHA-256: d570f3ca885a6e675142a34ed702e099092e5ff229c77670d9086630fd7dc793
font_01_sfnt_off00006313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6313 10080 bytes
SHA-256: 36010926065a81df007ae89e44c7bb5db29b998b0e194788326d6c63376d382f

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