Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcb0a4ce5c3b03e…

MALICIOUS

PDF

45.3 KB Created: 2020-07-29 15:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 537b60b8f5d13c8475e10dace5d4ed2e SHA-1: a0335de30a460a381d15e3cd5cbcdcc38f5057e0 SHA-256: 7bcb0a4ce5c3b03e37367066780bf68208194b7e61892f03bf67d4f4cd2b4a12
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 a redirector service known for malicious activity. The primary redirect URL is designed to lure users with keywords related to engineering drawings. While no scripts were directly extracted, the PDF structure and link farm heuristic strongly suggest an attempt to lead users to malicious content, likely for phishing or malware distribution.

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.com/pify?keyword=engineering+drawing+sectioning+exercises+pdf
    • http://files.theartsinguthrie.org/uploads/1/3/1/8/131857758/cee778aa.pdf
    • http://files.showuplifestyle.com/uploads/1/3/0/7/130775520/bcb589d11aff2e.pdf
    • http://files.hccflmetz.com/uploads/1/3/0/7/130776123/89fe2a86947.pdf
    • http://files.stpaulsyr.org/uploads/1/3/2/7/132712080/3051535.pdf
    • http://files.rachelgrubbmusic.com/uploads/1/3/1/3/131398095/2f848a19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/56972830222.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6561/files/4100662967.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/pupizemusumi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6660/3158/files/morosupuxogopaxekijav.pdf
    • https://cdn.shopify.com/s/files/1/0430/4040/7701/files/gozozewarinavanibemo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9592/5671/files/bubama.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/87405141325.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7118/files/mapinomiwivesusomekikiwev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53446206952.pdf
    • https://cdn.shopify.com/s/files/1/0431/0089/7440/files/34302189239.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/lazutemiremodasaxomino.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_off000074cc.bin
7720abd343457229d0a20fcddcf0abad5fda6986c5aea0a253ca607fe6c4bb31
pdf-font-stream PDF embedded font (sfnt) at offset 0x74CC 5196 bytes
font_01_sfnt_off0000869d.bin
14da8bb6b3080b0b22212dbdd48eda8c30fef44a5304167971d1dc7316c79f3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x869D 9732 bytes