Malicious PDF — malware analysis report

Static analysis result for SHA-256 5012facdf3607933…

MALICIOUS

PDF

112.0 KB Created: 2020-08-12 14:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 393f1aa9e0ab4cd71efc349d90ba9a07 SHA-1: 470029d9b7ae02d10f72133e309ddb48bf26b07c SHA-256: 5012facdf3607933ab2083221939e7868d7297593e13b3b72bb7bb29d95c7a6f
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text suggesting a lure related to 'reading and writing skills' and includes the malicious URL. The ML_NYX_PDF_MALICIOUS heuristic also strongly suggests malicious intent. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a larger link farm designed to attract traffic.

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.cc/pify?keyword=unlock+reading+and+writing+skills+pdf
    • http://files.jackappaleague.com/uploads/1/3/2/7/132710676/2624627.pdf
    • http://xaxubaw.keokitavares.net/uploads/1/3/2/6/132695663/32df8c818d2.pdf
    • http://files.speedcontainerline.com/uploads/1/3/1/3/131383651/zadowa.pdf
    • http://jelokovew.4jarchitecture.com/uploads/1/3/0/8/130874655/9829043.pdf
    • http://files.bewellacupunctureclinic.com/uploads/1/3/1/0/131070452/pabunefete.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/wirale.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/wiwiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/0304/4263/files/sotimis.pdf
    • https://cdn.shopify.com/s/files/1/0438/4358/4162/files/21st_century_teachers_tales_phonics_in_reading_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5345/files/midas_trend_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7650/2175/files/dosukegazajem.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/berger_color_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3414/files/52103752678.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6968/files/8302353384.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/54975672832.pdf
    • https://cdn.shopify.com/s/files/1/0433/3617/1688/files/wiring_simplified_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/0214/9539/files/rounding_numbers_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5735/files/xijefiwom.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1125/files/delixotipib.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_off000172e4.bin
10a4d1f02191e3e3f5e3f7f35bb95fcb612bb602f69078dd527bb2f9e4f9cd93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x172E4 5468 bytes
font_01_sfnt_off0001859d.bin
819ac01584b0ad6c5fca600b256d0ecabcd507a264fc36aa18459885fd387e95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1859D 13664 bytes

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