Malicious PDF — malware analysis report

Static analysis result for SHA-256 686b8f0d5e1851f4…

MALICIOUS

PDF

46.1 KB Created: 2020-09-03 00:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fecacb9ed20ef97713289b4f532da4fa SHA-1: fc1433621f18d82b45e64738002910a41bc83bc6 SHA-256: 686b8f0d5e1851f47619a44bf7ae1fbd7a0b93a71eec0f7aac1545b77c54f202
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with 28 external PDF links, including a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.link/wix?keyword=happy+birthday+to+you+mohammed+rafi', suggesting a lure to malicious content. The ML classifier strongly indicates maliciousness, and the presence of numerous links points to a spam or SEO poisoning campaign.

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=happy+birthday+to+you+mohammed+rafi
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/0aab01_79694c07c1144766b32c41c65a77ace8.pdf
    • https://static.usrfiles.com/ugd/158fb9_eb1c3c3d82a44828b12131eedc32f2b1.pdf
    • https://static.usrfiles.com/ugd/417718_7880857c348b4efc8a352909d8457500.pdf
    • https://static.usrfiles.com/ugd/b8c837_275931a6218d46978e50a8921bcc6fe1.pdf
    • https://static.usrfiles.com/ugd/b8c837_109c11e779594eff83c1b5f4ee0ce557.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/87388660638.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/sezuvupovenedimuwi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1884/4322/files/spelling_words_list_e-_3_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/kannada_movie_arjun_film_song.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/94043073647.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3407/files/not_enough_memory_to_read_worksheet_powerpoint.pdf
    • https://cdn.shopify.com/s/files/1/0432/8869/0844/files/semillas_de_grandeza.pdf
    • https://cdn.shopify.com/s/files/1/0437/6159/8616/files/xaninanebizakabutonojal.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6918/files/bible_stories_about_faith.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b17.bin
3dd00b69625f238b99d6b5d110fb5772e8f13c7c4d1c7ff56b96f33014344a94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B17 8804 bytes
font_01_sfnt_off000068c3.bin
15b4cda172f95294fac035bdccb1e136061765e15a09c3efdbebf164776b5e13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C3 5048 bytes
font_02_sfnt_off000079ee.bin
9c023ca686aa6a5c38861dd64d92abf5bae77a6a9c551f841439c8b08f021681		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79EE 10320 bytes
font_03_sfnt_off00009d39.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D39 4324 bytes

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