Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff8e04d6bd83aba…

MALICIOUS

PDF

39.4 KB Created: 2020-08-06 06:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a076c55b4eb94861599d1c4c6f942d1 SHA-1: d50119798a7cc4dd7fa4bad1099df03efe870963 SHA-256: aff8e04d6bd83abaef1b49f5620c888be648631d6e503cd808ff08cd2e86520b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=bobina+toroidal+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL.

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=bobina+toroidal+pdf
    • http://rawazola.fulbrightpta.com/uploads/1/3/0/7/130739826/fidobokunag_vekidat_xemon.pdf
    • http://wubewuno.narayanahotelandresidences.com/uploads/1/3/1/6/131607131/xunexuperutesiz-ginavidomevar-pijugepokolig-pukinivufe.pdf
    • http://files.mistoyo.com/uploads/1/3/0/7/130775934/3634499.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/68151884447.pdf
    • https://cdn.shopify.com/s/files/1/0432/3187/1139/files/72676668002.pdf
    • https://cdn.shopify.com/s/files/1/0435/1728/0408/files/65717354210.pdf
    • https://cdn.shopify.com/s/files/1/0448/9006/3003/files/atmosferas_peter_zumthor.pdf
    • https://cdn.shopify.com/s/files/1/0429/0753/3475/files/36859921713.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/2004989068.pdf
    • https://cdn.shopify.com/s/files/1/0446/7536/7065/files/how_to_hack_psp.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1800/files/gevogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/jojezim.pdf
    • https://cdn.shopify.com/s/files/1/0433/7375/6572/files/basic_concepts_java_programming.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/gisiliju.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/96221042447.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9323/files/matusasipafa.pdf
    • https://cdn.shopify.com/s/files/1/0444/6447/2231/files/cbse_8th_class_maths_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8920/files/4598269154.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_off00005194.bin
223b4627f7e4ef40191d17cc9f9ade2698f562d411287c87f9ef91c484aa25db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5194 4716 bytes
font_01_sfnt_off0000618a.bin
ccb87677005f24d6b3de1fa6fb5d96c7b1db81dbfabf01e48280999edbe6dc37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x618A 9792 bytes
font_02_sfnt_off000082f9.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F9 4324 bytes

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