Malicious PDF — malware analysis report

Static analysis result for SHA-256 372396fdd0422096…

MALICIOUS

PDF

46.3 KB Created: 2020-08-12 11:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f70cb4b16371d087710ee9cf4787605b SHA-1: b2c2eb3b052d93eecc75aa38378615090b48a52f SHA-256: 372396fdd042209638c47943b1897ec3e200d93a35b6421628c7986b780769e4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to a link farm hosted on cdn.shopify.com. One of these URLs, https://ttraff.ru/wb?keyword=macro%20y%20micronutrientes%20del%20suelo%20pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain the URLs directly, suggesting a lure to external malicious content.

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/wb?keyword=macro%20y%20micronutrientes%20del%20suelo%20pdf
    • http://files.inspirecreativeservices.com/uploads/1/3/0/7/130776393/naromomab_zesafigupabijan_lexutasise_lanodamig.pdf
    • http://files.glendha-tafny.com/uploads/1/3/1/4/131453370/nosulibegovob.pdf
    • http://jazuvi.nc39thmasonicdistrict.com/uploads/1/3/1/8/131856917/9c67ae036d.pdf
    • http://files.greentarafarm.com/uploads/1/3/0/8/130814774/2633758.pdf
    • https://cdn.shopify.com/s/files/1/0429/9030/5443/files/97143672675.pdf
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/dubojodimuwokuwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/zuxexusev.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/jogaxijozemax.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3829/files/zuragaxesunakoveniwikumi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6577/7059/files/72722911960.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3170/files/6th_grade_math_cbe_practice_test_texas.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/82670221721.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/zosiguregagin.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5976/files/luvupiwadematogunixe.pdf
    • https://cdn.shopify.com/s/files/1/0436/8557/6857/files/oxford_dictionary_english_to_kannada_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_off0000664a.bin
dd13d60e37784af1c0d3e0346e86802841a2eff93c35e7400a9702aff91a42a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x664A 5288 bytes
font_01_sfnt_off00007832.bin
f65d69460c36400ffb54296f097781d7fe0d022990657127affab5f6f2a4bacd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7832 11108 bytes
font_02_sfnt_off00009c5b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5B 4324 bytes

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