Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9eba340fe7685aa…

MALICIOUS

PDF

55.2 KB Created: 2020-07-30 12:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1354fa7555baa9504b7fc69d5bea407 SHA-1: 21eed676b21c91c8e2278082feaa0fe167cd6183 SHA-256: b9eba340fe7685aa260b60789159cf9aab3219ea4ed608e4baa52fb672735600
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains keywords related to 'Kalimba music book pdf', suggesting a lure to attract users. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content.

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=kalimba+music+book+pdf
    • http://files.kissfitnessprogram.com/uploads/1/3/1/3/131379042/xepawusaruzoseso.pdf
    • http://files.thegreenmedicineshop.com/uploads/1/3/1/4/131454297/99eac.pdf
    • http://files.neuropsyfi.com/uploads/1/3/1/4/131453595/255936.pdf
    • http://files.complexclear.com/uploads/1/3/1/4/131482926/908623.pdf
    • http://files.sino-oilfiltration.com/uploads/1/3/0/7/130740073/zogafomuxixi.pdf
    • http://files.sino-oilfiltration.com/uploads/1/3/0/7/130740073/zogafomuxixi
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/libimurirajavuvujefad.pdf
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/mukimubadatujujatakufi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/remuletovateropelilegaxit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0474/7168/files/vuvekad.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7409/files/22326156325.pdf
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/17728968936.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/ramujepidijofefuwebejoxuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/5692/9687/files/faxizesetejobomega.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/vupululomujikuna.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83759083977.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/3490560520.pdf
    • https://cdn.shopify.com/s/files/1/0428/3029/9292/files/zawekerezoxizuxofili.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/12989827776.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_off00009aa1.bin
dafc704e3d477c4378058ae4d2a2a99a492e8c9cbfe8225395ce42209e967383		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA1 4956 bytes
font_01_sfnt_off0000ab71.bin
0f98c9f2dcd21e5bce81d057be3458092f7596d54f36f81115037b7796e4c364		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB71 10256 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.