Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfb0491f86caf92…

MALICIOUS

PDF

36.7 KB Created: 2020-08-25 02:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85b2f30c48c5366d6307b21c119eb36d SHA-1: 1eb608e0fe13d53ebc18d913556d5461e7d6a13c SHA-256: 6dfb0491f86caf92dad7e639f6bc1963bbe2120edece165ffbe5e5810e66d043
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=apc+smart+ups+service+manual'. This URL is presented within the document body, disguised as a service manual download. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=apc+smart+ups+service+manual
    • http://files.theboho.ca/uploads/1/3/0/7/130775987/nonidenus.pdf
    • http://files.ukesterbrown.com/uploads/1/3/0/7/130739154/115570f57d611a7.pdf
    • http://files.championhouseofcare.org/uploads/1/3/2/6/132695306/pifakul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9275/5103/files/malimexarenoxonatuluzitin.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6507/files/architecture_english_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0433/4125/0714/files/lufinoxuzedamisidid.pdf
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/bhartiya_itihas_evam_rashtriya_andolan_drishti.pdf
    • https://cdn.shopify.com/s/files/1/0430/5456/3477/files/48775097433.pdf
    • https://cdn.shopify.com/s/files/1/0437/8312/7191/files/solving_exponential_equations_with_common_bases_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/1404/3294/files/human_anatomy_for_medical_students.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/74557233757.pdf
    • https://cdn.shopify.com/s/files/1/0437/8991/0165/files/tuwoxarilevilivagujebepot.pdf
    • https://cdn.shopify.com/s/files/1/0446/1549/9939/files/advanced_level_computer_science_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/gowijivibofidifexemad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a03.bin
42f80eda7cb0d2cdefcd2f05b28bf9008fa229ff9703eb7a4444d3013050110b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A03 5128 bytes
font_01_sfnt_off00005b23.bin
5c50f4cb69aeee5b81095be8e666b92e3326533d48cbc43d292acdadbc1103ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B23 1412 bytes
font_02_sfnt_off000062d6.bin
cf663f213d3387b0e777215bce4ce94ac43a00ce85ec2d0b263c221fa8079e0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D6 10264 bytes

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