Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2ac31619d9b10b…

MALICIOUS

PDF

55.0 KB Created: 2020-08-19 06:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77c98dedda88abe7ce854beceaa9d50e SHA-1: cbc14a00c58e2928a4b18891879215d8aa0ae52e SHA-256: 6e2ac31619d9b10bd4198673d71700d59c1174e742066ca5f023a6c0b0b47f47
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to various PDF files, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL and a keyword suggesting a lure for 'photo editor apk for android 4.0'. The presence of embedded URLs and the redirector link strongly suggest an attempt to direct users to malicious content or further stages of an attack.

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=photo+editor+apk+for+android+4.+0
    • http://fatog.thehealerinyouutah.com/uploads/1/3/1/6/131636665/mogowupimulidib.pdf
    • http://files.noamonn.com/uploads/1/3/1/4/131437615/4023781.pdf
    • http://files.infinityequestrian.com/uploads/1/3/0/7/130739662/moligufukinetaxavuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0264/2075/files/fukobimanog.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6855/files/17960468444.pdf
    • https://cdn.shopify.com/s/files/1/0437/3548/2529/files/70791998574.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3022/files/calligraphy_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8936/files/badokizomusesilaz.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/74824502892.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/beatitudes_commentary.pdf
    • https://cdn.shopify.com/s/files/1/0437/4295/3626/files/29013524417.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/24070009248.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/88545848544.pdf
    • https://cdn.shopify.com/s/files/1/0436/4559/9904/files/94526980035.pdf
    • https://cdn.shopify.com/s/files/1/0437/9761/0657/files/44917087072.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/51125988898.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c4e.bin
4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C4E 6588 bytes
font_01_sfnt_off00006cc7.bin
a41eb7b7ad48461cd0b7be379639f49a4774c1fdef158408212ae76b7eccb960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC7 5248 bytes
font_02_sfnt_off00007e97.bin
5848cfd460eb83e7d714dde68cf806c88a7412b04df53926e4ed43b709c57d85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E97 6236 bytes
font_03_sfnt_off000094be.bin
4d07a117e4237ceea7efff726a287327b3c9895c97f5190beb8a12036c372512		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94BE 10624 bytes
font_04_sfnt_off0000b900.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB900 16092 bytes

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