Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5be08480a1f8fe…

MALICIOUS

PDF

34.0 KB Created: 2020-08-25 16:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 033dde234805a0d9ca86268bb1e455f5 SHA-1: a69b21d336577d849b9d03fdbf7a22808a69ab9a SHA-256: 0f5be08480a1f8fe0931c29c0cbf4a714ed35a5d6197761285eac30b36880936
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm infrastructure, with one prominent link leading to a known malicious redirector. The document body, though heavily obfuscated, contains the URL for the malicious redirector, suggesting an attempt to trick users into visiting it. 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.ru/pify?keyword=expanding+brackets+with+surds+worksheet
    • http://files.pentonparkbrewery.com/uploads/1/3/1/6/131606807/890001bbe2.pdf
    • http://files.fryeburgwaterdistrict.org/uploads/1/3/2/7/132741149/3455089.pdf
    • http://files.gmnite.com/uploads/1/3/0/7/130740210/8463483.pdf
    • http://files.queencityproam.com/uploads/1/3/1/0/131070920/3392669.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/9340/5339/files/learn_arabic_language.pdf
    • https://cdn.shopify.com/s/files/1/0433/7516/5594/files/26864629478.pdf
    • https://cdn.shopify.com/s/files/1/0460/1954/3199/files/android_16_dokkan.pdf
    • https://cdn.shopify.com/s/files/1/0434/8729/7696/files/9493094050.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/90435222305.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voxetevew.pdf
    • https://cdn.shopify.com/s/files/1/0431/5181/8903/files/role_of_commercial_banks_in_economic_development_of_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/guvufimajoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4333/files/audacity_plugins_autotune_free.pdf
    • https://cdn.shopify.com/s/files/1/0465/2600/5406/files/workplace_harassment_policy.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9277/files/wiveme.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/minirefotapobizezuloxot.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_off00004646.bin
bfc73600bf28bcf6058bec7ebd05e6587ac2c75969b2f89a3c730c08635f6d61
pdf-font-stream PDF embedded font (sfnt) at offset 0x4646 5624 bytes
font_01_sfnt_off0000596f.bin
3a4da1a42ac939c42d8cf5c94c4cbe9fc0cf08298348f04b0872063f36f432d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x596F 9912 bytes