Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cea8e2719ac735…

MALICIOUS

PDF

38.5 KB Created: 2020-09-01 00:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0000259aabe5aedac09e599cf538ada SHA-1: c90e9b464a9052443cf1da218f79d13fa51976b0 SHA-256: e8cea8e2719ac73506f1d4dfab343fea22d9ec9fb54574b6eb2b8ac8d60a37b0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm designed to appear as legitimate content, but it redirects to a malicious URL. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content or phishing pages.

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.com/wix?keyword=red+colour+background+vector+free
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/errol_morris_believing_is_seeing.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/940034781.pdf
    • https://cdn.shopify.com/s/files/1/0459/7494/5959/files/free_car_boot_sale_poster_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/integral_calculus_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0456/9146/9983/files/fractions_addition_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/5122/9089/files/zutojaxiletubupa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2277/7496/files/38525863744.pdf
    • https://cdn.shopify.com/s/files/1/0437/3030/5175/files/55020675808.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0435/4965/5203/files/antivirus_for_windows_server_2012_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7346/files/zomisafatakomuzugadapezed.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/60998811695.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/polymerase_chain_reaction_types.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/46299668337.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_off00004e6d.bin
1dc12798d3a2e7fb86e0239fe6bf2d658ba9c8fce0429ed16d2bbccc7c9ee85a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E6D 5116 bytes
font_01_sfnt_off00005fe6.bin
deb4759cb59f3911fc7cd8ab9a1d75ee5a920a7632948a9c564e900068b4a250
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE6 9220 bytes
font_02_sfnt_off00007f56.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F56 4324 bytes