Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e5aa3a6ac11357…

MALICIOUS

PDF

55.7 KB Created: 2020-08-29 10:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc8b9f46a437c1a05e5e76728d8aef32 SHA-1: 7722461b21c4b1e96fc460aca974b7ac3b0f65c9 SHA-256: e5e5aa3a6ac113573b669122d37b1f3d7370b91f3909314139edd7f462623119
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and contains a large number of embedded external links, indicating a link farm or redirection attempt. One of the embedded URLs, 'https://ttraff.cc/wix?keyword=north+america+total+solar+eclipse', is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and references to 'static.usrfiles.com', which hosts numerous other PDF files. This suggests a campaign focused on driving traffic through a network of linked documents.

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=north+america+total+solar+eclipse
    • https://static.usrfiles.com/ugd/b8c837_8a741c2f450e490d8d5542c3a90a17ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_65f5a4aa69d9414ab67941a57846e3ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_d57c29cfbea74b18957df0616ed1d60c.pdf
    • https://static.usrfiles.com/ugd/b8c837_14adb31cc52b42c2910f88d46b30196b.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0c2275576d54cdbb059520f99d8ca0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e02019584a954817afa1533844b0729b.pdf
    • https://static.usrfiles.com/ugd/b8c837_dca248b2fdd34075aa563d43fe792528.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcdcae093c5d4f0183a0be9bb8c53f65.pdf
    • https://static.usrfiles.com/ugd/b8c837_72be01af8c2e40ee908e4c332e8229b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c3cc0356b834e2e870de99316f5df94.pdf
    • https://cdn.shopify.com/s/files/1/0433/3335/3627/files/wosapafugilu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8888/7460/files/16844614973.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/pdf_to_word_macbook_air.pdf
    • https://cdn.shopify.com/s/files/1/0430/9254/1589/files/54270748483.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/oncogenic_osteomalacia.pdf
    • https://static.usrfiles.com/ugd/b8c837_de634ada4f454ed1aa0ee8463617ecf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ecca8e6416e440db3b65cac44bffcda.pdf
    • https://static.usrfiles.com/ugd/b8c837_196c2bca36d245068e84c488f6c85757.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_off00008968.bin
7b56023b63bb88b4aaf0cc8f7918650fb7a6a73f1dae854493942ec93f6869f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8968 4824 bytes
font_01_sfnt_off000099c8.bin
b78d51f2444bd26cb90fbfe8f632d6c438de64547efc7e7d9eddcff2f748973a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99C8 13008 bytes
font_02_sfnt_off0000c368.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC368 4324 bytes

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