Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bf02b26fcb0b8a…

MALICIOUS

PDF

45.7 KB Created: 2020-09-01 06:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cccb76486fc8cb177863556ae3d2147 SHA-1: 8f6ca35463ff1eb51ad7b6e7329ba8e67f464304 SHA-256: 63bf02b26fcb0b8a4a1d0cb624bd601815be2953d53f6d4d98a9fb08f1e400b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'practice act reading test with answers'. The presence of many external links, including a malicious redirector, indicates an attempt to direct the user to harmful content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to drive traffic to malicious sites.

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.cc/wix?keyword=practice+act+reading+test+with+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d9d1f5_ec8d8a79b2f943c9be66deadbd9ab929.pdf
    • https://static.usrfiles.com/ugd/d902bb_3ebeabed581a4e559f1a759556e13c1b.pdf
    • https://static.usrfiles.com/ugd/18f527_a8a1c0290fd04dcd8d23b0a6121c84bb.pdf
    • https://static.usrfiles.com/ugd/105a8c_ced3fc330cc043c483c3f41c5d8c6114.pdf
    • https://static.usrfiles.com/ugd/cc15ef_564ddcceec244d31b527f0041401160c.pdf
    • https://static.usrfiles.com/ugd/de60da_b3c172339e8848ef9608f5c234e38e62.pdf
    • https://static.usrfiles.com/ugd/de60da_d7b52880b53e4cadb3e8107249282bdb.pdf
    • https://cdn.shopify.com/s/files/1/0435/6489/2323/files/suzizupedisevokozologewi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2960/2205/files/10859645830.pdf
    • https://cdn.shopify.com/s/files/1/0439/0181/2904/files/caldeiro_azul_marcelo_gleiser.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/office_ergonomics.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/breaking_dawn_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/wogamapitopozinot.pdf
    • https://cdn.shopify.com/s/files/1/0430/7995/8679/files/32991118312.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/pibilakovuzokedajanosuwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/8415/1974/files/toro_lawn_mower_parts_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/97951839001.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000740a.bin
1bc7524c0479bed60d0787d4d856a8d0adfce6cfc768712fb16e276b48fa0e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x740A 5264 bytes
font_01_sfnt_off000085f8.bin
ee5abba5c98edadd7c034c530d11057e48262c5c11b3dc365d00a1054d8353af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85F8 10608 bytes

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