Malicious PDF — malware analysis report

Static analysis result for SHA-256 91be3eb6658be420…

MALICIOUS

PDF

68.2 KB Created: 2020-07-30 03:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c31fff222ad3766c10d27e8a826ce82 SHA-1: 0266de620145a55b91a87ebfbea260287bc01c94 SHA-256: 91be3eb6658be420c7e7a05f757a32b66264467d05db04488ec4a34430660e22
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword related to 'amino acids synthesis pdf' to lure users. Additionally, a large number of links to Shopify-hosted PDFs were found, with one example being cdn.shopify.com/s/files/1/0430/5348/2135/files/kawev.pdf. The ML classifier also strongly indicated maliciousness.

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=amino+acids+synthesis+pdf
    • http://files.redworks3d.com/uploads/1/3/1/0/131070178/relefug.pdf
    • http://files.united-townfinancial.com/uploads/1/3/2/6/132681586/lubinajag.pdf
    • http://files.tomsfordcollection.com/uploads/1/3/0/7/130740200/litabozad-vabixoku.pdf
    • http://files.thehomeconversion.com/uploads/1/3/1/8/131856162/rojomelamoki_kilidobo_nodiwifiverikuf.pdf
    • http://files.zaneranney.com/uploads/1/3/0/7/130738850/zokelopuvabubebopa.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/kawev.pdf
    • https://cdn.shopify.com/s/files/1/0440/7453/3014/files/fijupofowimoda.pdf
    • https://cdn.shopify.com/s/files/1/0429/4659/2924/files/sisodunipiwufokepanola.pdf
    • https://cdn.shopify.com/s/files/1/0430/8113/8343/files/62033906282.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/12586543374.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/42730346048.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/53198935408.pdf
    • https://cdn.shopify.com/s/files/1/0436/6571/9449/files/nitemurejupusewer.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4312/files/nononewubomasifivi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6138/files/23644377641.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0815/files/9446331066.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_off0000b884.bin
91ff9464136b5ff229d8f36427140312278c68eae3eb8683440485772abf7ff7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB884 5144 bytes
font_01_sfnt_off0000c9dc.bin
6233d12da454fecb95ea37a20a7d92ab6135fab1b3bc8f0cdd89bfaa6db3df55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 10504 bytes
font_02_sfnt_off0000edff.bin
64e13322576ebe4b9a20b8efdba1cb2c8bc01163a7c4e1ba1f667a2d7cf8e6df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 16116 bytes

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