Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b31054b195bf8a…

MALICIOUS

PDF

70.8 KB Created: 2020-08-26 17:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b74f6615cb737c317ac7a597ae39384 SHA-1: 5ff23cf3a0a1936f2b645db92db494b92ed731f5 SHA-256: c4b31054b195bf8aa07cdcfe4671b0c8ae41860833d4b690d27c9f3035be3ee0
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is likely used to funnel users to a malicious site.

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=libro+lautaro+pdf
    • http://wezoberoz.pureexistencedance.com/uploads/1/3/0/7/130739892/4077893.pdf
    • http://fezezogim.cambridgesupervisiontraining.org/uploads/1/3/2/6/132681337/divef.pdf
    • https://cdn.shopify.com/s/files/1/0430/7025/9357/files/wopuzigubutuwepugerulixi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3143/6186/files/attendance_record_template_excel.pdf
    • https://cdn.shopify.com/s/files/1/0438/4522/2550/files/21471032357.pdf
    • https://cdn.shopify.com/s/files/1/0438/2402/1664/files/medicare_part_a_application.pdf
    • https://cdn.shopify.com/s/files/1/0434/2480/9122/files/50625453131.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/capsule_general_knowledge_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/libros_cabala_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0436/4346/9974/files/didikakobapepimabevo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8114/files/33437030150.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/dusikokijemugevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0822/0574/files/animoji_for_iphone_x_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/3626/3078/files/veredinep.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/gobejuroxovofidutemejoba.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_off0000d1a5.bin
cd703ef9a8a4470c8a66c1b3c9b708d10753b4a95578c246424571df1e688227
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 4936 bytes
font_01_sfnt_off0000e274.bin
937cbcca9abcfd6b6ae5536216297d636c632f8245f951a809e64964dc9c595f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 14388 bytes