Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e27068798d2a98b…

MALICIOUS

PDF

45.9 KB Created: 2020-09-17 21:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d81e0ca6ca0eb90b40f4fa74d66a0976 SHA-1: 944255be84fd935cc46db577d33308297d3e1a90 SHA-256: 4e27068798d2a98b161074ea669b64f7b391b9f8bea69211f8081270f143ecd2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.club/wix?keyword=sharekm+1.0.19+apk+download', which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains references to 'sharekm 1.0.19 apk download', reinforcing the lure.

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.club/wix?keyword=sharekm+1.0.19+apk+download
    • https://cdn.shopify.com/s/files/1/0460/6446/8123/files/blotter_and_police_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/2293/4435/files/rupinder_gandhi_2_full_movie_filmyhit.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3554/files/pp2_curriculum_design.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/domarub.pdf
    • https://cdn.shopify.com/s/files/1/0430/7219/2669/files/basotho_history.pdf
    • https://e7e3826e-b783-472a-bab0-88f7aaf1e233.filesusr.com/ugd/132250_25cb66f1c87c4ec79419aa60d4fa50a3.pdf?index=true
    • https://ee850b6c-8737-4163-b4c5-24929de39e0b.filesusr.com/ugd/162fe6_0290de4c942e4fb4b4da67d6d79f0155.pdf?index=true
    • https://e273cde6-0175-4dcd-942b-57a3cb581c36.filesusr.com/ugd/6c032c_89063fe4b76b46138bee8f49a7eff720.pdf?index=true
    • https://342f747e-344a-473f-a89b-cec7a0f29739.filesusr.com/ugd/3bf302_6f8ceff6778a4b5a89b0ca25668a8a4d.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/4306/9845/files/fazonigivuxagigituvire.pdf
    • https://cdn.shopify.com/s/files/1/0434/6013/3031/files/kti_pneumonia_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0432/6653/9673/files/luvijiro.pdf
    • https://cdn.shopify.com/s/files/1/0429/3702/4668/files/dementia_vs_delirium.pdf
    • https://cdn.shopify.com/s/files/1/0465/0211/7528/files/dususewebujamosen.pdf
    • https://cdn.shopify.com/s/files/1/0433/8846/9398/files/tatebuvideganonodidofat.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006de2.bin
6fda10188b276d6c32b763de246e2418bee8fa0b162a8828b66444894e7e958d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE2 5660 bytes
font_01_sfnt_off00008114.bin
d84f6e236e8b332a5a926c7dc9b0affe2d83d4a1aa0a7f8a4f6e3b85b04a3b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8114 13124 bytes

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