Malicious PDF — malware analysis report

Static analysis result for SHA-256 7459fee3b7ecfe83…

MALICIOUS

PDF

47.0 KB Created: 2020-08-19 14:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 242835fe229b871b18ae32f04a9867fd SHA-1: a330ee85c8232979634102a4d4d258f76741f962 SHA-256: 7459fee3b7ecfe83cb771bd35539231a2224e2192bd766a967f030d314a35d7f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, includes the URL 'https://ttraff.cc/pify?keyword=fundamentals+of+physics+10th+edition+checkpoint+answers', which is flagged as malicious. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the malicious redirector.

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/pify?keyword=fundamentals+of+physics+10th+edition+checkpoint+answers
    • http://files.marytateengels.com/uploads/1/3/1/1/131164033/efc03da58f3a19.pdf
    • http://dukojuwek.jackiecardytextiles.com/uploads/1/3/0/9/130969723/vububebijo.pdf
    • http://mofuza.blackprincehikes.org/uploads/1/3/0/8/130874631/9158845.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0452/4870/8769/files/cinquenta_tons_de_cinza.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/fuxugiletapat.pdf
    • https://cdn.shopify.com/s/files/1/0444/4015/8374/files/learn_python_3_the_hard_way_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/5834/8703/files/44797923776.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/77885917035.pdf
    • https://cdn.shopify.com/s/files/1/0449/7191/7471/files/aspen_hysys_introduction.pdf
    • https://cdn.shopify.com/s/files/1/0430/5246/6325/files/gigidivimi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5687/3128/files/bobanuwitenurazugugajakul.pdf
    • https://cdn.shopify.com/s/files/1/0434/7936/7846/files/18224936020.pdf
    • https://cdn.shopify.com/s/files/1/0436/1990/9794/files/lumufaxavab.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/linear_programming_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/8571395997.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/amenorrea_secundaria_causas.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_off00006922.bin
51897927cdb456ca62eb3233428126c1fee7e896d3cc1013957bdda4bc7a6dec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6922 5684 bytes
font_01_sfnt_off00007c62.bin
2af3e9db1f284ae727d9acf117b1d4cea2de3c1a2ced84fe37ef686371377d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C62 10516 bytes
font_02_sfnt_off0000a024.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA024 4324 bytes

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