Malicious PDF — malware analysis report

Static analysis result for SHA-256 4087f80e782e25de…

MALICIOUS

PDF

49.9 KB Created: 2020-09-05 00:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c12e7f37bbd3a300e40f62c7695446d SHA-1: 65717bce42b8dcb2133ab1ac1cee616679b6b482 SHA-256: 4087f80e782e25de1289c52267b3e7968c433c9dbf90ee7294a9b9b3448b8590
152 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, including a known malicious redirector. The primary lure appears to be 'fun printable worksheets for middle school students', aiming to trick users into clicking through to potentially harmful content. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link-based attack.

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.link/wix?keyword=fun+printable+worksheets+for+middle+school+students
    • https://static.usrfiles.com/ugd/b8c837_60e58ff5224a480da5784657af1b4e42.pdf
    • https://static.usrfiles.com/ugd/d4579c_b99b4edd1f4e4e1eb7503b948ad5ca1d.pdf
    • https://static.usrfiles.com/ugd/48f461_ef5d1a30fe574b57a792e17f61828f0d.pdf
    • https://static.usrfiles.com/ugd/a18aa6_e6310b47f4c9484ab51bbd92cda42fc5.pdf
    • https://static.usrfiles.com/ugd/804ff6_02ff93ea2fd74cc598661e5903f8df13.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7127/files/49529485090.pdf
    • https://cdn.shopify.com/s/files/1/0435/6741/5457/files/prevention_of_atrocities_act_1995.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/carbonization_process.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0260/files/apple_inc_history.pdf
    • https://cdn.shopify.com/s/files/1/0431/7967/1718/files/pedudetamavuruxemopifu.pdf
    • https://static.usrfiles.com/ugd/b8c837_7807c67147024923a9a68799d7abf13d.pdf
    • https://static.usrfiles.com/ugd/c0fca2_d444f708c5ce4209b30d72f0d7bbb549.pdf
    • https://static.usrfiles.com/ugd/585b1d_99421795c5b545878b62b60a128ee854.pdf
    • https://cdn.shopify.com/s/files/1/0445/7873/4239/files/lightweight_reader_windows.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4396/files/48346755412.pdf
    • https://cdn.shopify.com/s/files/1/0434/4571/5109/files/38264204582.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/31517143507.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/setotibilejagekezifevebiv.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_off00007246.bin
87400c78233b228d9c5e96c6f5e6c17073541385e003bdcd4d175fdca2993e11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7246 5528 bytes
font_01_sfnt_off000084eb.bin
b9210057f02e6ac1d8886b4926e9ffd8f4c2e2820d54f8714adb3e1014f32704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84EB 11196 bytes
font_02_sfnt_off0000a9ce.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9CE 4324 bytes

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