Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a32cf3ead3143bd…

MALICIOUS

PDF

48.4 KB Created: 2020-08-12 01:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a406674e0eff49d7e9ba18bd8d713770 SHA-1: 1fafdc177d28f106391c9bff5120af36840ca48f SHA-256: 6a32cf3ead3143bdca0615b6addeae2c4c73838051e2449367cbb902cbac2a4f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at `ttraff.cc`. The document body, though heavily obfuscated, contains the URL `https://ttraff.cc/pify?keyword=anemia+ferropenica+en+el+adulto+pdf`, indicating a potential lure to a malicious site disguised as a medical document. No scripts were extracted, but the presence of multiple PDF links and a malicious redirector points towards a phishing or traffic-driving scheme.

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=anemia+ferropenica+en+el+adulto+pdf
    • http://files.cbcasheville.org/uploads/1/3/2/6/132683289/misuvogo.pdf
    • http://files.bikiniusa.com/uploads/1/3/2/6/132682868/0b6b9b007.pdf
    • http://jajurevij.extravagantadvent.com/uploads/1/3/1/4/131438888/vigaj.pdf
    • http://tadobos.mchpublicrelations.com/uploads/1/3/2/6/132681504/kegewibalimok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.pdf
    • https://cdn.shopify.com/s/files/1/0431/0731/9974/files/10141231564.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/dilifomora.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/fofafanuriges.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/buzekezig.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/stanadyne_injector_pumps.pdf
    • https://cdn.shopify.com/s/files/1/0435/5332/5219/files/89_dodge_ram.pdf
    • https://cdn.shopify.com/s/files/1/0434/7455/0950/files/vim_relative_line_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0432/7086/5052/files/89921006946.pdf
    • https://cdn.shopify.com/s/files/1/0429/5865/1545/files/kibivororoto.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99397771733.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/php_parsing_url.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/attach_file_to_email_vba.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/90374900149.pdf
    • https://cdn.shopify.com/s/files/1/0448/3589/7505/files/27543098684.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_off00007006.bin
f719bcbdc485ca3343247abd12964cabda7648a664f912cf1df281ed324c3017		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7006 5112 bytes
font_01_sfnt_off0000814a.bin
0ac7ae875a32b139f54cc8d548092524464615c97605cd9583514d83eaec6798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814A 16032 bytes

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