Malicious PDF — malware analysis report

Static analysis result for SHA-256 101f3ed610035ff6…

MALICIOUS

PDF

48.4 KB Created: 2020-07-21 17:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce94287b3fa4b8f96995ff4bbc38e879 SHA-1: 25c860a2ec58bf09244eb128e7e26e92ffcb986b SHA-256: 101f3ed610035ff63849a23978e768360a19adab4ed05ed4889bd63a270eab58
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a lure instructing the user to enable macros or editing, a common technique for malware droppers. It also contains a critical heuristic firing for a PDF redirector link pointing to 'ttraff.ru', which is known malicious infrastructure. The PDF also hosts a large number of external PDF links, suggesting a link farm for SEO manipulation or distribution. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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.ru/wb?keyword=pdf%20editor%20mac%20preview
    • http://files.atplanned.com/uploads/1/3/2/6/132681436/bapupu.pdf
    • http://files.westfielddentalpa.com/uploads/1/3/0/7/130775942/bavef_kezujuwusuk_javexolizepun.pdf
    • http://files.sandywoodsmusic.com/uploads/1/3/2/6/132695986/javuguxozexaxa.pdf
    • http://files.levitytherapeutics.com/uploads/1/3/0/7/130740051/kulazuduwiximifad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/tadoxedakupagasije.pdf
    • https://cdn.shopify.com/s/files/1/0430/5240/0789/files/liresezivizozibifev.pdf
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/kejubiwibebib.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1594/files/24344933960.pdf
    • https://pitosabutage.files.wordpress.com/2020/07/bewirasamutoxatebovifow.pdf
    • https://puwugeboje.files.wordpress.com/2020/07/butefa.pdf
    • https://sofusobovax.files.wordpress.com/2020/06/tidusozetolitog.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/xerafefaresutesin.pdf
    • https://cdn.shopify.com/s/files/1/0436/0021/6232/files/jopanivojelezadowaje.pdf
    • https://cdn.shopify.com/s/files/1/0432/6840/7464/files/4167115301.pdf
    • https://cdn.shopify.com/s/files/1/0431/6977/5782/files/nupixugelemekuxexigulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/22306766576.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/89777115491.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69296453687.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/fadinenijukokinutam.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_off0000808b.bin
ab2f3313f7cb6d918b1fe9e3747da307adb92cfc73cdc03710c173b0c38d619d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x808B 4928 bytes
font_01_sfnt_off0000915c.bin
9e13bfc8a4b869aae6113ef2acf80c050aba48befcffd0e6b1d3210b212356c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x915C 10264 bytes

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