Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b088a4564fd69db…

MALICIOUS

PDF

57.3 KB Created: 2020-09-01 17:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d45a907586a43f66e21946a10fa564d3 SHA-1: db2c16bfd8cb48f627c8716c455dabadb29cd251 SHA-256: 2b088a4564fd69db2380c525413034c3626af641924d5585a79d86cddca056b7
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'addition and subtraction of fraction worksheet pdf' and the malicious URL, suggesting a lure for educational content that redirects to a harmful site. 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/wix?keyword=addition+and+subtraction+of+fraction+worksheet+pdf
    • https://static.usrfiles.com/ugd/a382ee_306a242be00d4f319cc174c935557493.pdf
    • https://static.usrfiles.com/ugd/b8c837_265f266e688f4bf7bd1c5f8275d824ef.pdf
    • https://static.usrfiles.com/ugd/76b6de_b71c01c444ff42698c7cdda357c50366.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/4274587103.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/derivative_of_relu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4141/5580/files/bijurifap.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/44865068690.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_b52c6587e07c474a958ab643ff005d42.pdf
    • https://static.usrfiles.com/ugd/739437_4293d402264048659b3cf33296e70a0a.pdf
    • https://static.usrfiles.com/ugd/7a11b0_50dfc7eb67bb406bb990e318e1783285.pdf
    • https://static.usrfiles.com/ugd/77d535_8851ee2a7f1f4242a2e32db51bdd7536.pdf
    • https://static.usrfiles.com/ugd/b7306e_7505c8ff98334e31b8ee1d1821888ddc.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/81855624417.pdf
    • https://cdn.shopify.com/s/files/1/0435/0646/6975/files/fractions_adding_unlike_denominators_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0452/5621/2640/files/amisom_in_somalia.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/juxilutivoraxob.pdf
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/linunigox.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/
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/4

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008dfc.bin
3a7a207c5b3f9193452cfc8aa39419862bb6e8c9d56f545a34a1b1143eab426d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFC 5496 bytes
font_01_sfnt_off0000a0b9.bin
744c36ecdee2253eb25184e493f302501458394c5218aa50a9d180020972ede3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B9 9712 bytes
font_02_sfnt_off0000c239.bin
edc33fe94617b35fa5734827a91efdc9665031ac3a5a8b8018a6396f4204b3d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC239 16116 bytes

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