Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f3097a7013c7a0…

MALICIOUS

PDF

65.7 KB Created: 2020-08-24 22:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 077eb8fe64566d8bf2ee4af6603db390 SHA-1: d07a547115dff4295a971687c64548b6ef7b0677 SHA-256: f2f3097a7013c7a0e3c4b307a07f1fb938731c3b07b3364ce4533df126fc6bc9
152 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with a critical heuristic firing for PDF_SEO_LINK_FARM. One of these links, https://ttraff.com/pify?keyword=farming+valley+guide, is identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'Farming valley guide' and includes the malicious URL, suggesting a lure to a malicious site. 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=farming+valley+guide
    • http://files.problemgambling.ie/uploads/1/3/1/8/131856446/f262d75422573d.pdf
    • http://jojokip.vajloogkeebhmoob.org/uploads/1/3/1/1/131163898/vibuja_dejinesifa_kezufanolu_robanefifituso.pdf
    • http://files.spectrarte.com/uploads/1/3/0/7/130776152/5662254.pdf
    • https://cdn.shopify.com/s/files/1/0460/1744/6055/files/jafewadijefilunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/virawovidigepifizebepab.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9446/files/bloom_s_taxonomy_teacher_planning_kit.pdf
    • https://cdn.shopify.com/s/files/1/0438/9624/2331/files/83385622456.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/rirofader.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/marine_insurance_underwriting_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/rasolojukarogizepado.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/tamil_vowels_and_consonants_chart.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/56345908649.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8234/files/gagopirebamuzirokazigojut.pdf
    • https://cdn.shopify.com/s/files/1/0459/2746/5127/files/all_free_android_app_store.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_off0000af39.bin
718a1610dc272c72fa8b8a9ba5aefc51fe433345e7a0531eba683720c1388eb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF39 5084 bytes
font_01_sfnt_off0000c078.bin
6cddcf237ca72399dc05714fea29e50652a3d9bbd06004334999577ac867924a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC078 10420 bytes
font_02_sfnt_off0000e437.bin
bc7e3f6831be34686de02ce7be2a06b9f1fa2b1a298201cd6e3dc3baf4672bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 16376 bytes

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