Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd643646f8cdfa5…

MALICIOUS

PDF

37.3 KB Created: 2020-08-30 20:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6aea6c5a4faa05b07b9de792d49b7224 SHA-1: b712a6c8f79fe8aaec629b85da488308583c5c28 SHA-256: 0cd643646f8cdfa54c855d2635f4860c781cab6fd8531769be1c9a722757de8e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, creating a link farm. One of the primary links, https://ttraff.cc/wix?keyword=telugu+novels+online+free+download, is identified as a malicious redirector. This suggests the document is designed to drive traffic to malicious infrastructure under the guise of providing free novel downloads.

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=telugu+novels+online+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5986/3961/files/20283640712.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1133/files/sonic_adventure_2_battle_ar_codes.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/situvovuxomakagubok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22411539251.pdf
    • https://cdn.shopify.com/s/files/1/0466/3469/6869/files/77482437661.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ed645975933482990576d0024d40b0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_79f7511c81a6460597ceabda20b33dc2.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf8c1b0fa2ee44d4af2c781ab214e05d.pdf
    • https://static.usrfiles.com/ugd/625844_2f74de22a3fa4029a8f1162a67bd813a.pdf
    • https://static.usrfiles.com/ugd/6116da_6157dd0e77694419a4cfc13dab346dba.pdf
    • https://static.usrfiles.com/ugd/b8c837_8de2c3f5a3e14d688bca221f8f91ed6d.pdf
    • https://static.usrfiles.com/ugd/79e0dc_34420708a2c9465d8ef9ec74162a8122.pdf
    • https://static.usrfiles.com/ugd/585b1d_2fb3575aad304bb68f52d2882b920f79.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_2eb70b2a4fba4ecca6744b063645f091.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_off000054a7.bin
04ca3900aab31408255745989adba55c008a2b336af04a5d4f88b8e1b3f0a099
pdf-font-stream PDF embedded font (sfnt) at offset 0x54A7 5176 bytes
font_01_sfnt_off0000666a.bin
d3cefd471d16e3600bdb46a3d9ddc45aca1499ccc71c2c4326b8bf69bfb32f87
pdf-font-stream PDF embedded font (sfnt) at offset 0x666A 10000 bytes