Malicious PDF — malware analysis report

Static analysis result for SHA-256 0305a29d64245645…

MALICIOUS

PDF

41.6 KB Created: 2020-09-02 11:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8295651d37e447af4cdd7284ad4c33ab SHA-1: 2bd7dd4474d3f2fed2b252d3b33f7e8e6742f562 SHA-256: 0305a29d64245645d54daa5188ed40ce365b1d2eb06f35c97c8f1ccb821ce97d
154 Risk Score

Malware Insights

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

The PDF contains numerous links disguised as academic papers, with one prominent link directing to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to redirect the user to malicious infrastructure. The document body is heavily obfuscated and contains a URL that appears to be part of the lure.

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=econometrics+research+paper+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8b2c09_57cc91c14a264bdd9deeda2d7c9e865d.pdf
    • https://static.usrfiles.com/ugd/33c377_fd7f62efcb1948d2aa75a2de2100e13f.pdf
    • https://static.usrfiles.com/ugd/b8c837_be56a772b8cb4c14b2a0628747d72321.pdf
    • https://static.usrfiles.com/ugd/0c4177_24508f6d86944f0cb42e14d85fea04c2.pdf
    • https://static.usrfiles.com/ugd/9e41f0_b16af5483b3b4a7db17474ef7372b2e7.pdf
    • https://static.usrfiles.com/ugd/3bf302_48b3aa08395c4a35be7b7b8ae5eb1edc.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d50b7e52fc346ba9299f91c652bb6f6.pdf
    • https://static.usrfiles.com/ugd/3e9e83_7cc14041689543c58a6cb6875b117856.pdf
    • https://static.usrfiles.com/ugd/b8c837_b19415cbbbb84587b00bd428bcd33622.pdf
    • https://static.usrfiles.com/ugd/ac51ce_29762d8061c14fa7aa6c1d0d8e2ca93a.pdf
    • https://static.usrfiles.com/ugd/003b86_9acbe8d2e8a94214aa2e90545ac3c5cc.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/types_of_inorganic_fertilizer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33078626275.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4355/files/kibikedidugabogag.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7154/files/tureduveriz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/teduzifuxelilimis.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_off000064f5.bin
95cca9312754dba4daf328e839f69ed4b712df432922838f8b34bec16137f828
pdf-font-stream PDF embedded font (sfnt) at offset 0x64F5 5320 bytes
font_01_sfnt_off000076e7.bin
976a5f60c9a7b2f959394288068365591a21492fe3d0cb985f37c8670aec1811
pdf-font-stream PDF embedded font (sfnt) at offset 0x76E7 10208 bytes