Malicious PDF — malware analysis report

Static analysis result for SHA-256 f697efd43a5c23b5…

MALICIOUS

PDF

45.6 KB Created: 2020-08-07 03:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21c45c4badf7955a73138c106abc9c1f SHA-1: c9896dc8a44781f413f2726ae11c24ff521c1dda SHA-256: f697efd43a5c23b5d23f156ea84a002a7517f37b6b9f3a115b4e9d68a62536d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, many pointing to a link farm, and one critical heuristic identified a malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the redirector, suggesting a phishing or scam attempt. The ML classifier strongly indicated maliciousness. No scripts were extracted from this sample.

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=business+development+report+pdf
    • http://xowulu.tinawhitfieldart.com/uploads/1/3/1/4/131437423/pezopapulidokogakuj.pdf
    • http://navewojim.hbscooters.com/uploads/1/3/2/6/132681504/9735345.pdf
    • http://files.vintagefisherpricetoysbyauroramorningstar.com/uploads/1/3/2/6/132682731/kabutisub_tuxokifetovuniz_bifevop_pajifuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/1740/2530/files/ella_fitzgerald_summertime.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6079/files/magic_training_guide_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/83726506013.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/javascript_parse_html.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/fivodelarovofozad.pdf
    • https://cdn.shopify.com/s/files/1/0446/6681/4617/files/label_the_continents_and_oceans_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/death_of_a_salesman_full_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/20173266749.pdf
    • https://cdn.shopify.com/s/files/1/0429/8165/4679/files/fazoxaradakamugejete.pdf
    • https://cdn.shopify.com/s/files/1/0431/4287/3249/files/29540415378.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1594/files/kubota_l2500_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4985/1811/files/48930828775.pdf
    • https://cdn.shopify.com/s/files/1/0427/9743/2999/files/oceanography_free_download.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_off00005d71.bin
a5b1a7cf14668d1b2ce2d12a820a83538478a6df496f8f5673a5447219bb4211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D71 5088 bytes
font_01_sfnt_off00006eb2.bin
f2deacc3cab4fae0b80558669372c0b95899987fd33a26b5ffe3df6ada9be235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB2 10620 bytes
font_02_sfnt_off000092bd.bin
1e89c178478f6fc4376b2b39057ee28b473664e698311a5fb60d01f6931867b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92BD 16116 bytes

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