Malicious PDF — malware analysis report

Static analysis result for SHA-256 279eeeddf4e57eeb…

MALICIOUS

PDF

40.1 KB Created: 2020-08-07 12:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3edacbd9ce49311101e8074b4c941c3 SHA-1: d8699bb2f801ce91a9bdb238516707a3f58236f1 SHA-256: 279eeeddf4e57eeb9c74cbe47b093dd3ab606b98cc1af2e85c279035fc9501a2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'alphabet coloring pages'. The primary malicious IOC is the redirector URL, which is likely used to serve a secondary payload. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=alphabet+coloring+pages+az+pdf
    • http://files.uwle.net/uploads/1/3/1/3/131380754/9449023.pdf
    • http://files.np2c.co.nz/uploads/1/3/0/7/130739081/radisipum.pdf
    • http://files.sunnydawnpetgrooming.com/uploads/1/3/1/6/131637606/gazogefevuzen.pdf
    • http://files.wildflowerwomen.net/uploads/1/3/0/9/130969080/likok.pdf
    • http://files.mygasz.com/uploads/1/3/0/7/130775784/4aa51e38e379d31.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/wedozovazuvifoge.pdf
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/89355079512.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/xifesixiselevop.pdf
    • https://cdn.shopify.com/s/files/1/0441/0513/8328/files/38538215186.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/xanepamalupowomurafer.pdf
    • https://cdn.shopify.com/s/files/1/0429/2562/1404/files/30499923266.pdf
    • https://cdn.shopify.com/s/files/1/0434/8120/2854/files/61830211164.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6076/files/xegigopajodegunawabakoze.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/zuxumixubajetuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/0071/5674/files/videocon_bazooka_tv_circuit_diagram.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_off00005e08.bin
7cc80ef602831ee58ce25f86295fed4f461118ddae14fafd3635cd3aa8d4f4ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E08 5596 bytes
font_01_sfnt_off00007105.bin
403e15224f4a97d1d2082c303a0ff9ea7e626eb5726a54fa5757ece86d4906c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7105 10352 bytes