Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2731a6479b43ba3…

MALICIOUS

PDF

64.9 KB Created: 2020-08-13 21:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edc85a7c00080e79ea171a7390a29adc SHA-1: c849e0d9f16772b9d901bc0430eb23c628a1263a SHA-256: c2731a6479b43ba3f9efa0350c9be9c3ec7ff7f90a2e97940d75abbf3e441827
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to a worksheet and includes the primary malicious URL. The PDF_SEO_LINK_FARM heuristic suggests a large number of similar links are present, likely for SEO poisoning or traffic generation.

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=applications+of+right+triangle+trigonometry+worksheet
    • http://jukumo.fanosmusic.com/uploads/1/3/2/6/132681670/2882857.pdf
    • http://waxezus.calvarybaptisthopewell.com/uploads/1/3/1/4/131452903/kijukumutezit-dikeram-wixowovojep-dinax.pdf
    • http://wogasu.bellereidfarm.com/uploads/1/3/0/8/130813747/3278192.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15501301831.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/nesumezadediwe.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/28160537113.pdf
    • https://cdn.shopify.com/s/files/1/0435/8494/6333/files/86696163369.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pidepuwavulosetanujerepub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ligumugazawebamupewav.pdf
    • https://cdn.shopify.com/s/files/1/0431/8088/4129/files/85629351447.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13139855908.pdf
    • https://cdn.shopify.com/s/files/1/0432/3393/5519/files/andrea_hirata_sirkus_pohon.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1450/files/94696820140.pdf
    • https://cdn.shopify.com/s/files/1/0434/5646/3014/files/binary_options_candlestick_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/17970742109.pdf
    • https://cdn.shopify.com/s/files/1/0438/6127/8870/files/virukakumifepumejalarod.pdf
    • https://cdn.shopify.com/s/files/1/0454/0062/1224/files/vovobewafisewofisuzijibi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7539/5993/files/rupelenipimoze.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a616.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA616 2828 bytes
font_01_sfnt_off0000b011.bin
b27e5c6661d1dc57dba09449e9361c8d5eb1309096942bac4d8625d78df88af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB011 5464 bytes
font_02_sfnt_off0000c282.bin
d42b4fa8e16af3ab3496c5291f642433ac922a095eb197a25e6da6aba12259bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC282 10168 bytes
font_03_sfnt_off0000e512.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 4324 bytes

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