Malicious PDF — malware analysis report

Static analysis result for SHA-256 534a250056c768d4…

MALICIOUS

PDF

47.8 KB Created: 2020-08-01 19:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08f901aaaef9e79e2e9a1e4b7614b31b SHA-1: 6484fb7e778721d8f7fb454c8c93a3b21a40600e SHA-256: 534a250056c768d425e77e6a6f2f6bd2850ed46cfe5b21fc12f85c14760ebac9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=free+online+games+pogo', is designed to redirect users to potentially harmful content. The PDF also features a large number of external links, characteristic of a link farm, with many pointing to Shopify domains. The ML classifier strongly flagged this PDF as malicious.

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=free+online+games+pogo
    • http://files.pwbc.us/uploads/1/3/0/7/130776394/waned_sikopegevavud.pdf
    • http://files.clmconsulting.net/uploads/1/3/2/6/132681625/ee0dcb332b.pdf
    • http://files.kidseventtickets.com/uploads/1/3/0/7/130740213/9125299.pdf
    • http://files.wellspringoc.com/uploads/1/3/1/6/131607164/e9f23145b77.pdf
    • http://files.whatwoulddennisdo.com/uploads/1/3/0/7/130775220/piwow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/tadosakiwometabu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/38874642783.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5715/files/zegerafilubedubaviwogira.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdf
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/xokiwatiwetobufolevu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4302/8120/files/58830261495.pdf
    • https://cdn.shopify.com/s/files/1/0438/1350/3133/files/rulunar.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/newalojumibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85947343199.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dotedijulukamani.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/zamaguzidejiti.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2394/files/febisosurewoja.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9585/files/kinabi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006daf.bin
8af1990b6d2a053afaddd17dd8a1dda20077c551589582fc5a2387b2f0a5b085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAF 4804 bytes
font_01_sfnt_off00007ddc.bin
897a3a7458d5774574c95cb5a9d618fff82d1279bf9ea4f3f70a19d2cee3138e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDC 11400 bytes
font_02_sfnt_off0000a46d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA46D 4324 bytes

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