Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcb6440a830ab7d…

MALICIOUS

PDF

41.9 KB Created: 2020-08-09 14:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2444ab9152b17e41c52f93212174bd5 SHA-1: 7f2b4de0dae84e47ea15f5e7023827dd50aef0c5 SHA-256: 5bcb6440a830ab7d638a460b3578915ec56297d378dbc7089902d8bc2f04c05f
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a phishing or malware download site. The document body, though heavily obfuscated, contains the same malicious URL and references to other benign-looking PDFs hosted on Shopify, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier also strongly indicated maliciousness.

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=eversafe+fire+extinguisher+pdf
    • http://files.lameracandelaria.com/uploads/1/3/1/4/131409709/fosegupumaje_faledapaxu_tolujafevi_savevabizu.pdf
    • http://files.encircledbirth.com/uploads/1/3/0/7/130739021/kejiban-nirizopadaso-dinigabiripinok.pdf
    • http://basowu.belunasoap.com/uploads/1/3/1/1/131164250/watifugi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wonazonuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/85506427410.pdf
    • https://cdn.shopify.com/s/files/1/0431/9802/1793/files/convert_english_to_chinese_text.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1081/files/dalomeperovefisamal.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/46133622421.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/25710333353.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/free_rp_codes_list_2017.pdf
    • https://cdn.shopify.com/s/files/1/0440/5516/7126/files/tejunuxexabikovatib.pdf
    • https://cdn.shopify.com/s/files/1/0434/6452/3926/files/79053442187.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/45496304109.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/37082757998.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/somewopolibi.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_off000065b8.bin
b7a108b0a5c8cafffa9135935a156d7d0c1e2b72f45f44428660ecf3466ac723
pdf-font-stream PDF embedded font (sfnt) at offset 0x65B8 5356 bytes
font_01_sfnt_off000077f8.bin
8c6ec71dca647a99bfda51ea3cd85de5298e406c114c89697b54274acf4eda03
pdf-font-stream PDF embedded font (sfnt) at offset 0x77F8 10356 bytes