Malicious PDF — malware analysis report

Static analysis result for SHA-256 4444b71ba36129b4…

MALICIOUS

PDF

52.5 KB Created: 2020-08-14 01:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d436fefa3cdc75fa0084f455685d11e4 SHA-1: 07d429952239c3bdb214fae7ce248b2c1a77a8e3 SHA-256: 4444b71ba36129b44aaf8ab43d9dfa7163d811a3b5fe24af22e5e7466cb61280
152 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a known malicious redirector at `ttraff.ru`. The document body, though heavily obfuscated, contains the text 'Congruent shapes worksheet pdf', suggesting a lure to disguise malicious intent. The presence of a link farm and a critical heuristic firing for malicious redirectors strongly indicates this PDF is designed to redirect users to malicious sites, likely for phishing or malware delivery.

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=congruent+shapes+worksheet+pdf
    • http://files.allergysupportcentre.org/uploads/1/3/0/7/130740051/3856917.pdf
    • http://pimixi.gordonstonemusic.com/uploads/1/3/2/3/132303338/6560645.pdf
    • http://gopamebi.livewellbuddha.com/uploads/1/3/0/8/130814004/xoloxolalonog.pdf
    • http://files.rhandley.com/uploads/1/3/1/3/131383318/49446ba9d611fbe.pdf
    • http://baforunu.roni-nikol.com/uploads/1/3/1/6/131606490/meruvetumedini_nafanipes_fezedas_dobalaruwewase.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/14151658582.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xumilegimazuguvabunozanik.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5739/files/85558795895.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/99835873507.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/alastair_cook_autobiography.pdf
    • https://cdn.shopify.com/s/files/1/0438/0560/6049/files/how_to_export_to_word_macbook_air.pdf
    • https://cdn.shopify.com/s/files/1/0436/8151/3622/files/novivajogataradejajoze.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/sebewijitumu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9545/7946/files/green_day_uno_dos_tre.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1158/files/6_digit_number_generator.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4631/files/3774996156.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5522/files/pharma_sales_resumes.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_off00007ae0.bin
4bc9fdd59a6dfadaef761e0cc11b36d5f858e646fb3864e25b742fcc97e58b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE0 5332 bytes
font_01_sfnt_off00008d13.bin
7494607ad5c3ab8d37696a1bcf1761670d85e76528fe1b9483c8564fc89bd86d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D13 10052 bytes
font_02_sfnt_off0000af7c.bin
3da9309f7c28e01a20d15285b754fad9116e6eb7744d168a0fff2950d6122081		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7C 16072 bytes

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