Malicious PDF — malware analysis report

Static analysis result for SHA-256 5064940187312214…

MALICIOUS

PDF

41.6 KB Created: 2020-08-09 13:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6f25b67164f12153699b71d64df2632 SHA-1: 20739124798461a733f770320cfee39181e56537 SHA-256: 50649401873122141a3951cb3296722f84fd9ddc79dda448301228f11d428df1
150 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 identifying a malicious redirector. The document body, though partially corrupted, contains text related to 'addition worksheets for grade 1 pdf' and the malicious URL, suggesting a lure to disguise malicious intent. The primary malicious IOC is the redirector URL which is likely used to funnel victims to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=addition+worksheets+for+grade+1+pdf
    • http://files.tinmasoft.com/uploads/1/3/2/6/132681440/tojisifabudobev.pdf
    • http://files.ecorawstudio.com/uploads/1/3/2/8/132814680/babemenu.pdf
    • http://files.collegedreamsconsulting.com/uploads/1/3/2/6/132695517/gavonever.pdf
    • http://files.kennedy.glyncor.com/uploads/1/3/2/6/132695919/xigugatakupon.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/towog.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3633/files/7226773480.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/12092322719.pdf
    • https://cdn.shopify.com/s/files/1/0429/8211/3433/files/vemapuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/military_vehicle_inspection_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9120/files/shrug_copy_paste.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7507/files/kiwezipivum.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/kaxoxidefimagugawuwusura.pdf
    • https://cdn.shopify.com/s/files/1/0438/8130/0123/files/verotitozuzolexazo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65107231385.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/kujigidavewabofozijeval.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/bekevekanona.pdf
    • https://cdn.shopify.com/s/files/1/0434/7461/6472/files/architecture_design_course.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_off0000640a.bin
b81021a3d0c15cf42bfd5e0e94c4806a9b6ebff8565120900fb42d7b89c5c1ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x640A 5468 bytes
font_01_sfnt_off000076c1.bin
3f821765c4d0a8f60faa1e7733f01097f0859a413b7597f776a91ad0bfcad751
pdf-font-stream PDF embedded font (sfnt) at offset 0x76C1 10132 bytes