Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39f7085e2eafbaf…

MALICIOUS

PDF

42.4 KB Created: 2020-08-24 03:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f45630ce8f7ff4f04b31e6d78bc679f5 SHA-1: d88bd5baa691801ff6e37e8a316c907ed687a835 SHA-256: c39f7085e2eafbafeb5f5e514cb5f34629e3f090d87c812b83e41e2a19de71ae
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a redirector service (ttraff.ru) identified as malicious. The document body, though heavily obfuscated, contains the same redirector URL and keywords related to templates, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through these links to potentially malicious sites.

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.ru/pify?keyword=book+blurb+template+ks2
    • http://files.triangleparentingsupport.org/uploads/1/3/2/6/132683357/kilixiregupezo.pdf
    • http://files.flagnetworks.com/uploads/1/3/0/9/130969761/gazonu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0536/1821/files/godobuzesegusaxada.pdf
    • https://cdn.shopify.com/s/files/1/0435/2881/4741/files/zibelapimusuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/2890/4093/files/kudeminu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5674/files/biodiversit_animale.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5316/files/toefl_reading_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/4192/2977/files/sedenorogigororabakol.pdf
    • https://cdn.shopify.com/s/files/1/0429/2309/8279/files/niwomo.pdf
    • https://cdn.shopify.com/s/files/1/0452/4130/3202/files/vocabulary_for_ielts_file.pdf
    • https://cdn.shopify.com/s/files/1/0440/9422/6584/files/binomial_and_poisson_distribution.pdf
    • https://cdn.shopify.com/s/files/1/0432/3508/2402/files/bedulikorefanosoluzuzene.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/89443718782.pdf
    • https://cdn.shopify.com/s/files/1/0434/0406/6967/files/30745365467.pdf
    • https://cdn.shopify.com/s/files/1/0439/4608/2472/files/5117258040.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bf1.bin
09edb622cfc9212c8207411c5814e0b794987b8b31ac932447d9a307463a0139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF1 5080 bytes
font_01_sfnt_off00006d35.bin
5e794ba08d806310476e0714dc3ac3217faa34099101e411a2fc45e919961123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D35 9980 bytes
font_02_sfnt_off00008ee2.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE2 4324 bytes

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