Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f78b49933d363a…

MALICIOUS

PDF

43.4 KB Created: 2020-08-29 17:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd2253d43f7d506b3ce37412f2681ff7 SHA-1: ef88971dddb6688fcceefd92e854077aafabc5b2 SHA-256: 41f78b49933d363ab24fa973faba8d107e1b287d12a833bad7f0842d068bb1d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL. The ML classifier also strongly indicated maliciousness. The PDF also contains a large number of embedded links, suggesting a link farm or SEO poisoning attempt.

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/wix?keyword=tincion+simple+microbiologia
    • https://cdn.shopify.com/s/files/1/0431/0709/0581/files/wuzewusomuwuvarim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0602/5128/files/45638430139.pdf
    • https://cdn.shopify.com/s/files/1/0434/5357/9430/files/kufewuwesumidarixejoli.pdf
    • https://cdn.shopify.com/s/files/1/0431/1695/3751/files/15280009163.pdf
    • https://cdn.shopify.com/s/files/1/0432/8911/6836/files/11091967499.pdf
    • https://cdn.shopify.com/s/files/1/0430/7563/3306/files/ladadakusatitegimot.pdf
    • https://cdn.shopify.com/s/files/1/0447/5705/7687/files/klasifikasi_asma_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0433/3531/9702/files/spise_ananas_etter_egglsning.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5242/files/regedojujevamumevo.pdf
    • https://cdn.shopify.com/s/files/1/0462/4030/1216/files/54296343740.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0711/files/how_to_join_files_mac.pdf
    • https://cdn.shopify.com/s/files/1/0463/7717/3147/files/solucionario_matematicas_academicas.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/
    • https://cdn.shopify.com/s/files/1/0462/4030/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069c2.bin
2b8140e560386a16bba9d79c8f82c7464ebb6d3f06b2670a02e9f475614f3aac
pdf-font-stream PDF embedded font (sfnt) at offset 0x69C2 5340 bytes
font_01_sfnt_off00007bc7.bin
a291a13f94ab4302518a9fa3406778cb67f6bc45b6af1af7bc77a91cc8f7f039
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC7 11480 bytes