Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7bcfe346381578…

MALICIOUS

PDF

40.1 KB Created: 2020-08-07 18:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfb91d2ccd4d296bd48f258f4b5dbd51 SHA-1: bfdfbc34ba5a35a27dbc803acd17f0fb064133ad SHA-256: 1f7bcfe34638157833c596147d766ace23b508d8fd2678852a3396b0e85eabe4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL that is known to host malicious content. The document also contains a large number of external PDF links, many of which point to Shopify domains, suggesting an attempt to create a link farm for SEO manipulation or to obscure the malicious redirector.

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/pify?keyword=pirates+of+the+caribbean+piano+sheet+music+free+pdf
    • http://files.granitefallsbandprogram.com/uploads/1/3/1/1/131163737/3e88d754fb36e.pdf
    • http://files.thedolcevitadiaries.com/uploads/1/3/0/7/130739564/4135b119b50.pdf
    • http://nipaxo.bsdcouture.shop/uploads/1/3/1/0/131069934/e3050c9b4de94d9.pdf
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/86596034350.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3437/files/geporakajajikofogage.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/because_you_loved_me_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7061/0851/files/sac_state_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/0457/5387/files/19105301722.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/asus_rt-_n66u_firmware.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/rakonuwavijikawuwegow.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4872/files/femunaranagoxod.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/gewurazagudezewikor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84312174386.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/61819150969.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_off00005c68.bin
e2d8901a7fb2e09e8468947f91c88400cafbce2c935b66cd737cb01adda216bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C68 5504 bytes
font_01_sfnt_off00006eed.bin
58179fb7ed3d3820c99f15fc194e266532975479471baa8da427033c7af9b9d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EED 10640 bytes