Malicious PDF — malware analysis report

Static analysis result for SHA-256 41821d668e4711d5…

MALICIOUS

PDF

37.6 KB Created: 2020-08-12 10:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5232a318919ae77f2d0ec2a23f1f046 SHA-1: d535c5b18b38490402d92b5fb6532f8532223dbd SHA-256: 41821d668e4711d5380b5b44c3fb7a69125dd9a1b452a50ccf204ddcc887c888
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is also present in the document body and the extracted URLs. The document body text, though partially corrupted, includes 'Assurance wireless application pdf florida' and a URL that appears to be a lure. The PDF also contains a large number of external links, many pointing to Shopify domains, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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=assurance+wireless+application+pdf+florida
    • http://files.emmanuelbaptistchurchtn.com/uploads/1/3/0/7/130775760/pabagorasisoxawi.pdf
    • http://files.bluespeedsalt.com/uploads/1/3/1/0/131069789/fojurogosaki-kajetaninipafut-mazoxafi-mizaxavoga.pdf
    • http://files.spiritatwork.us/uploads/1/3/0/7/130775968/9853560.pdf
    • http://fotojop.christine-rothwell.com/uploads/1/3/2/6/132681947/2576029.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6556/files/2349926723.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43545787384.pdf
    • https://cdn.shopify.com/s/files/1/0438/5298/8566/files/treatment_of_gestational_diabetes.pdf
    • https://cdn.shopify.com/s/files/1/0432/6345/9486/files/86054721611.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/49328491322.pdf
    • https://cdn.shopify.com/s/files/1/0436/4635/3561/files/1963_chevy_c10.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5591/files/xobavukumagapujinu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6273/files/battle_stadium_don.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/54680098868.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/97125505961.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4594/files/55314639000.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_off000053a6.bin
2a2ab6eb554055cdc6630483ec9aeaffb6aa0701e804d8e312cde610690faecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x53A6 5228 bytes
font_01_sfnt_off0000658b.bin
cd9897df71a33bf1b292e090ad904ff7b254c196beeb882068cc0243095ed68c
pdf-font-stream PDF embedded font (sfnt) at offset 0x658B 10524 bytes