Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ce5e7d6af0c516…

MALICIOUS

PDF

41.3 KB Created: 2020-08-21 13:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec137881f9c835ab0c036fff5e8a4063 SHA-1: aceed500850a05c1c4195fbbba0537fe49ff2df9 SHA-256: d3ce5e7d6af0c51608872e5fe566ac1df653a08db24d9059e0f3049fc0c5cadd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'metric conversion challenge worksheet answers' and includes the malicious URL. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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=metric+conversion+challenge+worksheet+answers
    • http://xuzenup.runninsranch.com/uploads/1/3/1/4/131437626/wikerepoviravabik.pdf
    • http://files.cortlippe.com/uploads/1/3/0/7/130775679/8735054.pdf
    • http://wamul.goldenageacademy.org/uploads/1/3/0/7/130776585/6441789.pdf
    • http://files.abideministryofarlington.org/uploads/1/3/2/6/132695575/2022476.pdf
    • https://cdn.shopify.com/s/files/1/0447/8317/3798/files/school_supplies_worksheet_preschool.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/97278693537.pdf
    • https://cdn.shopify.com/s/files/1/0434/9411/3446/files/medojipodabi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/brachypodium_distachyon_transformation.pdf
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/61744215547.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.pdf
    • https://cdn.shopify.com/s/files/1/0437/1755/8426/files/adverbs_and_adjectives_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/sufuxisutexiloxavotoked.pdf
    • https://cdn.shopify.com/s/files/1/0431/6961/1930/files/5086255962.pdf
    • https://cdn.shopify.com/s/files/1/0432/0870/4164/files/98602413958.pdf
    • https://cdn.shopify.com/s/files/1/0434/8349/6600/files/16457144759.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/32815190623.pdf
    • https://cdn.shopify.com/s/files/1/0448/2914/7293/files/hallelujah_nuty_pianino.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_off00006376.bin
abb9a60ade7311a1c1171242c09e2a7b61a900e08db91473443a27577b9a0209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6376 5284 bytes
font_01_sfnt_off00007588.bin
4ca66fcae95565a4df1021646f01ba05344f14d068e5867f11de0455f14564ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7588 10128 bytes

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