Malicious PDF — malware analysis report

Static analysis result for SHA-256 997e35a44793c3b0…

MALICIOUS

PDF

98.5 KB Created: 2020-08-16 01:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcc82672d215eea4af9ca561fe2ca0e0 SHA-1: a8af41259500f6eebea9b0195bea029e0d521ccf SHA-256: 997e35a44793c3b0475f3e4e944fb0374927394068c9e8b0edeb1aa403137798
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.cc/pify?keyword=biogas+plant+images'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious URL is sufficient to determine the attack pattern.

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.cc/pify?keyword=biogas+plant+images
    • http://files.gilliantorckler.com/uploads/1/3/0/8/130874629/gomenevidi-kinepowa-xasokipa-xupuzateseroji.pdf
    • http://files.hackncraftnj.org/uploads/1/3/0/8/130814286/pafuzekusi.pdf
    • http://files.homegrownblooms.org/uploads/1/3/2/6/132695445/fitevi.pdf
    • https://cdn.shopify.com/s/files/1/0439/3120/5787/files/fivobijaneki.pdf
    • https://cdn.shopify.com/s/files/1/0427/4618/3847/files/book_of_synonyms_and_antonyms_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/14602643759.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/98519991697.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/calendar_method_apps_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/1485/5583/files/sample_appeal_letter_for_college_readmission.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/86341149014.pdf
    • https://cdn.shopify.com/s/files/1/0435/5611/0487/files/aspen_hysys_v8_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0440/0345/9230/files/70869134174.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6975/files/zakegabevudamujivaloxur.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/mokebonufozawubituv.pdf
    • https://cdn.shopify.com/s/files/1/0435/3464/7460/files/roland_barthes_mythologies.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001395b.bin
625b0cef567a576462c90e6e6e915ddf0310dbb368924970dfc1367278a8237e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1395B 5092 bytes
font_01_sfnt_off00014a9e.bin
44ec7db587c88a092bbe248074c31ba7f5495dcb709dd62017c7e461d4e5350d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9E 16160 bytes