Malicious PDF — malware analysis report

Static analysis result for SHA-256 713848d7654ee3ec…

MALICIOUS

PDF

40.4 KB Created: 2020-08-29 07:39:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74aab7e6992e84b1847147232d5f576e SHA-1: 7b402b12a955c30eadd09742028b02e4991c397b SHA-256: 713848d7654ee3ecde5fbb0f7cefb761ec008bc8149aaf55ad33d12015715bb7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure related to Cuban music and a large number of embedded links, many of which point to other PDF files hosted on Shopify. One of these links, https://ttraff.cc/wix?keyword=the+rough+guide+to+cuban+music, is identified as a malicious redirector. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure.

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.cc/wix?keyword=the+rough+guide+to+cuban+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7827/7525/files/number_the_stars_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/chapters_mod_apk_unlimited_diamonds.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/personal_pronouns_worksheet_for_class_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/69345791209.pdf
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/debate_motions.pdf
    • https://cdn.shopify.com/s/files/1/0428/0903/2863/files/tofoto.pdf
    • https://cdn.shopify.com/s/files/1/0430/0685/3269/files/60945684978.pdf
    • https://static.usrfiles.com/ugd/b8c837_babffb207e8143ed8cd33ab84d595b2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_882974bfd91d4483abc4bc256aa23e76.pdf
    • https://static.usrfiles.com/ugd/b8c837_6102768d76804396873798d0d77a7a9f.pdf
    • https://cdn.shopify.com/s/files/1/0434/1019/4582/files/ableton_live_9_lite_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/3147/8950/files/ropavaka.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/zeritefijagedos.pdf
    • https://cdn.shopify.com/s/files/1/0430/9096/8729/files/40781719370.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/sri_damodarastakam.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_off000060ce.bin
813254dc10c76cfa711d131f2e67e6cdffa67ee22712d0443d21b8a241bb8413
pdf-font-stream PDF embedded font (sfnt) at offset 0x60CE 5408 bytes
font_01_sfnt_off000072ff.bin
17119175c0613f286c95e62a66c13b7053f859a3a9290fb49f6e6206ba29708d
pdf-font-stream PDF embedded font (sfnt) at offset 0x72FF 9892 bytes