Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fe53096d481d02…

MALICIOUS

PDF

44.3 KB Created: 2020-08-31 04:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a11c3b15b1466b9bb16804c12a3749b SHA-1: 4e97e12c59bf35c461b14385d8596bb39820118b SHA-256: 10fe53096d481d028076671f6c8512d8702bb6278b5e8fa50fe1abd3b97b1224
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/wix?keyword=removing+skype+ads'. The document body, though heavily obfuscated, also contains this URL and numerous other PDF links, suggesting a link farm or redirection attempt. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to malicious infrastructure via a deceptive document.

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.com/wix?keyword=removing+skype+ads
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/52b593_ceba9856df4949fca37415297060cb13.pdf
    • https://static.usrfiles.com/ugd/08fe48_6ff7183d1ecd49f0a246bf40b0818012.pdf
    • https://static.usrfiles.com/ugd/b8c837_7746f27624a447689928a2356cdaa579.pdf
    • https://cdn.shopify.com/s/files/1/0435/1836/1755/files/american_sniper_full_movie_in_tamilyogi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0675/4970/files/44982664269.pdf
    • https://cdn.shopify.com/s/files/1/0437/5825/6286/files/bailaras_full_movie_filmywap_2017.pdf
    • https://static.usrfiles.com/ugd/fe83c3_c614117126a74588a1a8c609a14e7a1c.pdf
    • https://static.usrfiles.com/ugd/5b604d_4a9acaa07fa34472b595b3200b3604d5.pdf
    • https://static.usrfiles.com/ugd/de60da_bfbaf5f00f2f42f5a18b008161169696.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_86ae2b6adac3431f907c797213eb9642.pdf
    • https://static.usrfiles.com/ugd/e2f197_aea88a14190345709859744832c5a2fb.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_off00006231.bin
aa39495228285bb33f9e57a50065653389a5615ed0c70a138adf597980edf7f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 5092 bytes
font_01_sfnt_off0000737c.bin
9ce53df19d1d39a9040d2fb57675396b4e9d9ba9a3cb5578f493098044d27e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x737C 10352 bytes
font_02_sfnt_off000096f4.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96F4 4324 bytes

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