Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9a2c8816b11b19…

MALICIOUS

PDF

56.7 KB Created: 2020-08-03 04:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed2176f38c84fa22950bce9ba7128424 SHA-1: b65f5b9214a081036b0fcffb91686baabf90c439 SHA-256: bc9a2c8816b11b19e2bdc1387774abad46b4eea2852f74015da5d3af1f3bb5b3
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=introductory+econometrics+5th+edition+pdf', which is flagged as malicious. Additionally, the document exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which point to Shopify domains hosting other PDFs. The ML classifier strongly indicates maliciousness. The primary intent appears to be directing users to the malicious ttraff.ru domain.

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.ru/pify?keyword=introductory+econometrics+5th+edition+pdf
    • http://files.ncballcounseling.com/uploads/1/3/1/6/131606396/8b863fe9b29d0.pdf
    • http://files.allinclusivetennis.com/uploads/1/3/1/8/131871687/nitadoxatolal.pdf
    • http://files.teamanton.net/uploads/1/3/1/4/131407887/woguguxibux-malile-xuxuvipawa.pdf
    • http://files.guidelinefit.com/uploads/1/3/0/8/130874124/tixaligoju_zozosewoxasumup.pdf
    • https://cdn.shopify.com/s/files/1/0437/1172/5723/files/54608983543.pdf
    • https://cdn.shopify.com/s/files/1/0431/9333/5970/files/9167650746.pdf
    • https://cdn.shopify.com/s/files/1/0431/4932/8533/files/9130853076.pdf
    • https://cdn.shopify.com/s/files/1/0434/0154/3831/files/defepolomelalosimupare.pdf
    • https://cdn.shopify.com/s/files/1/0430/2507/2282/files/pigotubuxolug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voxetevew.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/doxilimakajikur.pdf
    • https://cdn.shopify.com/s/files/1/0432/1188/2659/files/30564060237.pdf
    • https://cdn.shopify.com/s/files/1/0431/9854/6084/files/71297285005.pdf
    • https://cdn.shopify.com/s/files/1/0428/2528/5791/files/2986704678.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5821/files/vopuxedifisati.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_off000092c0.bin
7407a25632c3239f8b4732cf04d283853b5da2499f10fee26264e5d34ae07a3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x92C0 5316 bytes
font_01_sfnt_off0000a4be.bin
64b111f4e6da83492ddbbecd431471397c60a7acba4845523f4f4a7198b98151
pdf-font-stream PDF embedded font (sfnt) at offset 0xA4BE 15800 bytes