Malicious PDF — malware analysis report

Static analysis result for SHA-256 72576fcddc40ce1e…

MALICIOUS

PDF

66.4 KB Created: 2020-08-05 05:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4939daf676fe57276f377678cae21dc6 SHA-1: 1a0d67d2114aa1a611aef4152f967ad7b9e96661 SHA-256: 72576fcddc40ce1ece0bd49adb2df45302ac4299efae0d39f514e0da78aee8b2
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that mirrors the suspicious redirector. The presence of numerous external PDF links, as flagged by 'PDF_SEO_LINK_FARM', suggests an attempt to obscure the malicious intent or distribute further malicious content. The ML classifier also strongly indicated maliciousness.

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=applications+of+right+triangle+trigonometry+worksheet+pdf
    • http://files.orovalley.org/uploads/1/3/1/4/131453213/1365872.pdf
    • http://files.baileybloomco.com/uploads/1/3/0/7/130775342/vedajopudafopuvu.pdf
    • http://files.shineon5k.com/uploads/1/3/1/8/131871658/f5f8546cae25.pdf
    • http://files.myenchantedlocket.com/uploads/1/3/1/4/131437119/16c22d153a62b5.pdf
    • http://files.meetthestephans.com/uploads/1/3/1/6/131606056/6192317.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/5453/0714/files/mofoxawowekilador.pdf
    • https://cdn.shopify.com/s/files/1/0432/8253/0472/files/26766965862.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/xamaxegapijes.pdf
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/70304660735.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1146/files/becoming_supernatural_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/9643/2021/files/81931194581.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8024/files/65225367291.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0443/5968/0156/files/ielts_reading_general_samples_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/3394/2426/files/vemobafezexiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/waxazozibisoruver.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_off0000ab63.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB63 2828 bytes
font_01_sfnt_off0000b55d.bin
ef3b49f69926f4f06702d4f20687bef77f73e85574319561078f2685b8daa725		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB55D 5604 bytes
font_02_sfnt_off0000c848.bin
40d476659e776b8b45cb947866d88e75d50275c484c55368a63b8531e663bc94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 10148 bytes
font_03_sfnt_off0000eab7.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 4324 bytes

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