Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d579b3687a42b2f…

MALICIOUS

PDF

41.0 KB Created: 2020-07-29 07:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8941c1d0c8512a155bafcd1efefd5603 SHA-1: cc1a9268a658941c8aa4f7e05e593281bd6ffef4 SHA-256: 5d579b3687a42b2f6daa57206951079f713e3a4970370a2e9b28bdcb3ed6a936
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, appears to be a lure related to 'Farewell to Manzanar'. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator of malicious intent.

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/pify?keyword=farewell+to+manzanar+comprehension+questions+and+answers
    • http://files.mariannemission.com/uploads/1/3/0/7/130775672/9abe14f36aedcba.pdf
    • http://files.teddynasrmusic.com/uploads/1/3/2/7/132740270/fenalaxadijubaniki.pdf
    • http://files.overzealous.ca/uploads/1/3/1/0/131070894/8454969.pdf
    • http://files.sueroupp.com/uploads/1/3/1/0/131070625/datazoxinetosad.pdf
    • http://files.ours-winnipeg.com/uploads/1/3/0/7/130776769/lemubuzexozurira.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21533622499.pdf
    • https://cdn.shopify.com/s/files/1/0435/6567/8755/files/lizutitekexoxiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/89262496022.pdf
    • https://cdn.shopify.com/s/files/1/0437/7916/2263/files/rinepexexukatuke.pdf
    • https://cdn.shopify.com/s/files/1/0429/1140/0102/files/15267428696.pdf
    • https://cdn.shopify.com/s/files/1/0432/3934/2247/files/31173743748.pdf
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/76863657192.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/tajibuzogezozumezafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0793/files/litununiwugubinefibopemi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9511/2347/files/82885203540.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7057/files/diweledomudasetewunewu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1096/5147/files/renorasawo.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_off0000626a.bin
aee00e3e10a5b658ab56320fe3861fa888d056a4f82a04ed4e0cb2e8678f227f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x626A 5416 bytes
font_01_sfnt_off000074b8.bin
1aeea66b1afd1fb574a17132db3e2e16790dec3e88801c82e0b1926994a6935a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 9948 bytes

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