Malicious PDF — malware analysis report

Static analysis result for SHA-256 6857a68a9bd37e59…

MALICIOUS

PDF

40.6 KB Created: 2020-08-10 13:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e82d57ddea700d4ebde3de3099878b17 SHA-1: 82123adfe25d6851a4221f49752bfa07d976495e SHA-256: 6857a68a9bd37e59e7807edba6bd57c94ca9ba555df5828fb3172bd76200b110
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a large number of embedded links, many of which point to external PDF files. One of the primary links, 'https://ttraff.ru/pify?keyword=laboratory+apparatus+and+their+uses+worksheet+pdf', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and numerous URLs, suggesting an attempt to manipulate search engine results or redirect users to 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=laboratory+apparatus+and+their+uses+worksheet+pdf
    • http://files.amsp.net/uploads/1/3/1/8/131856166/3f7a1.pdf
    • http://files.sunriseonlinecourses.com/uploads/1/3/1/3/131383330/zuganopazigeta.pdf
    • http://xixonumij.thesacredyes.com/uploads/1/3/1/3/131380005/zusokufemetoxizu.pdf
    • http://files.hairbyhkt.com/uploads/1/3/0/7/130776594/vulavimudepikas_sewidaf_xezawuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74832969368.pdf
    • https://cdn.shopify.com/s/files/1/0430/4837/0333/files/jadaxabubawojozimoze.pdf
    • https://cdn.shopify.com/s/files/1/0429/3571/3958/files/15760874946.pdf
    • https://cdn.shopify.com/s/files/1/0452/1476/1120/files/signed_binary_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/belexerafotofiroseralan.pdf
    • https://cdn.shopify.com/s/files/1/0437/4183/9511/files/livro_agrometeorologia_dos_cultivos.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/3762909362.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81143567733.pdf
    • https://cdn.shopify.com/s/files/1/0430/8126/9401/files/27824424186.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/denatured_alcohol_sds.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/37952025461.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_off000060cd.bin
1ce4cecebf93f581d1dd1db5f646a6d25afa6ed0df9d46df1301a96fae3d40d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60CD 5436 bytes
font_01_sfnt_off0000734f.bin
1ad5a08180f2728ebad86358cca8bd4e47a5ee3b3881ea5523ac74619290b0c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734F 9908 bytes

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