Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9a17d9718c8c45…

MALICIOUS

PDF

41.3 KB Created: 2020-09-07 15:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a916754936333f328f35d2926bd1db9f SHA-1: c032d2b1cedfd03776f618dbeee8838e0e1e85c4 SHA-256: 5b9a17d9718c8c456f6d27205a1f071340d68e85b3de494c49d3b0acf7fc96d1
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 Shopify domains, but one specific URL, https://ttraff.me/wix?keyword=dilations+and+similarity+worksheet+answers, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous links and the ML classifier's high confidence indicate a malicious intent to redirect users to harmful content.

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.me/wix?keyword=dilations+and+similarity+worksheet+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/34316624734.pdf
    • https://cdn.shopify.com/s/files/1/0433/2155/7150/files/rojovob.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6561/files/xodemezojavuderafabufi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1402/0505/files/duwonisixaruvolinibow.pdf
    • https://cdn.shopify.com/s/files/1/0464/7249/5272/files/hitachi_starboard_software_9._6.pdf
    • https://cdn.shopify.com/s/files/1/0432/3839/1970/files/dibemasikiwuwazaledubi.pdf
    • https://static.usrfiles.com/ugd/f6336d_910d4750d9bc4180901ac3d9c8b390a8.pdf
    • https://static.usrfiles.com/ugd/6df952_a28169fbc2e14bc5988084547bb23506.pdf
    • https://static.usrfiles.com/ugd/bd1c09_542f625ea9024c18b238468bc10b3e9e.pdf
    • https://static.usrfiles.com/ugd/3fb742_54ce00577b684e0aa5b97fbf12858b78.pdf
    • https://static.usrfiles.com/ugd/ea2c45_5f4f0a67152b4ba2a35be305cc0e550f.pdf
    • https://static.usrfiles.com/ugd/e643da_74fc5fe1146e43cb868c9a9cd17c6b32.pdf
    • https://static.usrfiles.com/ugd/9734e7_cd0673fbc3344b1fba649ab9edc85432.pdf
    • https://static.usrfiles.com/ugd/314c35_3f07494409d64dc78e16b14b34ca2cda.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_off00005fc9.bin
4739c16a3ec5aef7838d587bfdfc22d836fe583ab1b077cd914c52bed8bff642
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC9 5324 bytes
font_01_sfnt_off000071ce.bin
0792bd48309a6793f55d2806403e80e67b904b9f804e1977365afc7b655c622f
pdf-font-stream PDF embedded font (sfnt) at offset 0x71CE 11348 bytes