Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6661f89c03cdc27…

MALICIOUS

PDF

44.6 KB Created: 2020-08-08 22:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f406332736c901f45aacec89a5a6cb48 SHA-1: 4afa2b927327a6b48025e2729425d9a63a188044 SHA-256: a6661f89c03cdc27a4ad3e9198dbd368d8311ce9fa4bf1bd56e184cec3a40913
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, a common tactic for SEO poisoning or link farms. Crucially, one link directs to `ttraff.com`, identified as malicious redirector infrastructure. This suggests the document is designed to lure users to malicious sites, potentially for further exploitation or phishing. No scripts were extracted from this sample.

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.com/pify?keyword=arduino+projects+for+engineers+pdf
    • http://files.profecpaintersllc.com/uploads/1/3/1/6/131606175/fizev.pdf
    • http://files.shopkoco.com/uploads/1/3/2/6/132682813/gezafurefexafu-wikure-wexul-bozexozanok.pdf
    • http://files.alliejune.com/uploads/1/3/0/7/130776164/fefamekumilowisaguf.pdf
    • http://files.lutheranquarterly.com/uploads/1/3/0/7/130739371/d4eda508875879.pdf
    • https://cdn.shopify.com/s/files/1/0432/4048/9122/files/2832636959.pdf
    • https://cdn.shopify.com/s/files/1/0436/8593/7307/files/27719891834.pdf
    • https://cdn.shopify.com/s/files/1/0434/8067/8553/files/jalalekuketave.pdf
    • https://cdn.shopify.com/s/files/1/0430/1966/5561/files/bizimuvutamufazusigar.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8801/files/tojizexatidaseguzowat.pdf
    • https://cdn.shopify.com/s/files/1/0437/4586/9985/files/sejuvulosetakinavipovurij.pdf
    • https://cdn.shopify.com/s/files/1/0431/4585/5137/files/words_with_multiple_meanings_examples_and_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2871/files/lopir.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/31537754336.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/46349031803.pdf
    • https://cdn.shopify.com/s/files/1/0438/6462/1211/files/convert_google_spreadsheet_to.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/47116046686.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_off00007112.bin
57690ea13cc3e683d41d1530b691c20d7d26b9838ad3e80dbac7170352fa69e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7112 5148 bytes
font_01_sfnt_off000082b4.bin
4d7f9cb9932efafc302327106fb471e945688475e7a2901ff94a227525d01e72
pdf-font-stream PDF embedded font (sfnt) at offset 0x82B4 10248 bytes