Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98a270354ca53f5…

MALICIOUS

PDF

46.9 KB Created: 2020-09-16 23:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b41273817298a868b4bccaed486b7fc SHA-1: a52f3f3903d9e56dd908c7ad75c5e32810b8c1e0 SHA-256: f98a270354ca53f562c7ea404b2509b93140122c7a64c05e39fdaf80ff617983
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to a URL that prompts a download for 'vshare market apk'. This, combined with a PDF link farm heuristic, indicates a strong attempt to distribute potentially malicious applications. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the suspicious URL.

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=vshare+market+apk+download+for+android
    • http://files.peterrichardsart.com/uploads/1/3/1/8/131857213/57546e.pdf
    • http://files.primalfitnessleague.com/uploads/1/3/0/9/130969499/xerodikuzu.pdf
    • http://gajoru.rstne.com/uploads/1/3/2/8/132814930/8351640.pdf
    • https://cdn.shopify.com/s/files/1/0429/4564/2663/files/bi-_84_form_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9540/9311/files/nebirobemekuwidugukiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/kagevafojajep.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/bescherelle_cole_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetuvoveluganimuwejipas.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7925/files/clinical_cases_in_anesthesia_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/0862/0701/files/fawaxexafebuvanesetorilur.pdf
    • https://cdn.shopify.com/s/files/1/0437/4478/8634/files/luvoxepopisifaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2541/files/bhaskar_the_rascal_songs_free_320kbps.pdf
    • https://cdf3feb1-b324-43d7-a4d0-f7dd28882322.filesusr.com/ugd/cf9ff1_806147fc716d4cb8a972611a5846f182.pdf?index=true
    • https://ee7d70c6-29cc-4bcd-bacd-a86b8156c615.filesusr.com/ugd/23a6c3_0f405eefb120490c9ac5b0322d2fb275.pdf?index=true
    • https://1574f212-300e-4685-bd59-e20f957c075d.filesusr.com/ugd/ea2c45_b65314d63d624a1d830e11ad844af54d.pdf?index=true
    • https://98b9eee3-2883-40f5-b8bb-1ba5cc1fbbb3.filesusr.com/ugd/55f640_f51c5d3ba3144c4aa3992931933c42c4.pdf?index=true
    • 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_off000062ca.bin
86699a8ed13af35b63d897d66c87f074921b82d2626e5d4e8f8319abcd92b6cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62CA 5400 bytes
font_01_sfnt_off00007516.bin
81e917d45367e4b9192c8bf5690fd8f8b68887846a15042fad177c50b6b784a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7516 10608 bytes
font_02_sfnt_off00009948.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9948 16092 bytes

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