Malicious PDF — malware analysis report

Static analysis result for SHA-256 729ba6bd1fc708cc…

MALICIOUS

PDF

52.2 KB Created: 2020-09-03 00:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a939b2e1742d2b9752dac7baf7264f08 SHA-1: e85c27500025826a1961ae186b1634c546793201 SHA-256: 729ba6bd1fc708ccd1e70ce933a2a96761a1ffb7e90f72959c1fd74157e20e89
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same search query as the malicious URL, suggesting a lure for users seeking free movie content. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded links supports a phishing or redirection attack pattern.

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=cinderella+disney+movie++free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/4927/7845/files/12565519978.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wajomuxufukurojudi.pdf
    • https://cdn.shopify.com/s/files/1/0447/1685/1356/files/xememuralepimuzubimiwa.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/vudeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_dff7c2f01dfb49fc867614780af3b1a9.pdf
    • https://static.usrfiles.com/ugd/07625c_e6999fea39d544e8acdf637dd2ac2ece.pdf
    • https://static.usrfiles.com/ugd/a44510_06702060857f40aea1015a0e13aa7f77.pdf
    • https://static.usrfiles.com/ugd/16a96a_a4ad52c6c21a4482a797f0b71a9364da.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_662ea47d9f2a4746a7bfad731d91916b.pdf
    • https://static.usrfiles.com/ugd/740d8c_db3018dd0dd44c64aaaee2b8acee1e9b.pdf
    • https://static.usrfiles.com/ugd/bb3bf9_150cc729dc0142eaa7afb57195e4a73a.pdf
    • https://static.usrfiles.com/ugd/891219_df7ef06dc751403ebca737caf034401d.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/tostring_format_2_decimal_places_c.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/49497385696.pdf
    • https://cdn.shopify.com/s/files/1/0436/5615/1190/files/82728373409.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/nakodadululapevupove.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f7a.bin
0c8fa0c68cfae64026ec806e68e3e6374fd9eeda7af7f1b4646e0704c9260513		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7A 4948 bytes
font_01_sfnt_off00009039.bin
f7f1976d488a56e36f45f06dd13cf485613c4abfcad9a5b1f8c5dc5d1681e28d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9039 10620 bytes
font_02_sfnt_off0000b429.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB429 4324 bytes

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