Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a6ec79f37f463a…

MALICIOUS

PDF

33.9 KB Created: 2020-08-09 17:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f02a0fafd767d9f928e9030fb75f14f SHA-1: 271ae5b530c3d5c0ed4c74583839c239556bc80d SHA-256: c5a6ec79f37f463a7b358c898344a67d3a170314eb826a7be06db339b97480c9
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, ttraff.cc. The document body, though heavily obfuscated, appears to be a lure related to a lunar calendar, likely intended to trick users into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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=calendario+lunare+gennaio+2020+pdf
    • http://ratuzinuk.kinosaurusjakarta.com/uploads/1/3/1/8/131871390/wekufenotunituwuj.pdf
    • http://joziwofi.myroncotton.com/uploads/1/3/1/0/131070993/3176883.pdf
    • http://files.bunnywigglebottom.com/uploads/1/3/0/8/130874207/tawojel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/libidurekatomanazavevufi.pdf
    • https://cdn.shopify.com/s/files/1/0448/7377/7319/files/bullying_and_cyberbullying_word_search.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/dovudirofofoxokaka.pdf
    • https://cdn.shopify.com/s/files/1/0435/0764/6630/files/jurux.pdf
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/sevinajokoboba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/velokiw.pdf
    • https://cdn.shopify.com/s/files/1/0447/2215/9772/files/bsc_first_sem_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/fozul.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/31984218913.pdf
    • https://cdn.shopify.com/s/files/1/0436/4809/0270/files/stihl_fs_90_r_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7104/4774/files/frightful_s_mountain_chapter_7.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_off0000473a.bin
982606b06f7070b3de9905662be7d3b5f56e0d13a1049a876b0ca93227850592
pdf-font-stream PDF embedded font (sfnt) at offset 0x473A 5212 bytes
font_01_sfnt_off000058fd.bin
8447537b21bc586cef258c0b91278a9a19ce43f93384b762cd9b25bcaf90ba0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x58FD 9980 bytes