Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4edaac153f0bd4d…

MALICIOUS

PDF

41.0 KB Created: 2020-07-28 04:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc943b70d06333a46aa0ad07b077aae1 SHA-1: 5b34dacbead0c1f100c1e640c7f6238045a31ee4 SHA-256: b4edaac153f0bd4d2b14d3da8a9b152a604d9de951d842077121dac1c4863a86
152 Risk Score

Malware Insights

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

This 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 features a link farm with numerous external PDF links, many hosted on cdn.shopify.com. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content or phishing pages. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf.

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=performance+boat+brokerage+lake+of+the+ozarks
    • http://files.pocketchangetexas.com/uploads/1/3/1/4/131407051/bovilumiluse.pdf
    • http://files.kcpanhel.com/uploads/1/3/2/8/132815961/1055807.pdf
    • http://files.nlrtsa.com/uploads/1/3/1/4/131409017/kiruwoniwapusetetak.pdf
    • http://files.hifiaddiction.co.uk/uploads/1/3/1/4/131406075/1096995.pdf
    • http://files.kc
    • https://cdn.shopify.com/s/files/1/0436/1220/9309/files/xetuminivavegebigabu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5877/files/sadepijevafulo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/96593924853.pdf
    • https://cdn.shopify.com/s/files/1/0433/1683/8558/files/75880592993.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13503036424.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3259/files/29358570975.pdf
    • https://cdn.shopify.com/s/files/1/0437/2224/4264/files/tikoboluzedo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/tekenufew.pdf
    • https://cdn.shopify.com/s/files/1/0428/5857/8086/files/54995914776.pdf
    • https://cdn.shopify.com/s/files/1/0428/2892/3046/files/91980051550.pdf
    • https://cdn.shopify.com/s/files/1/0434/8136/6693/files/15419960064.pdf
    • https://cdn.shopify.com/s/files/1/0435/4949/1359/files/30103319921.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_off000061eb.bin
2c8c0a101b8f8168ff341335461a99841ee176f81c44627c409dafecb15bc3e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x61EB 5288 bytes
font_01_sfnt_off000073c1.bin
16c48b8dd3a032cc30e9443d9966b5f54f0ead00c0923fcac08b01e592874d5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x73C1 10188 bytes