Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb5af549e247a8c…

MALICIOUS

PDF

42.6 KB Created: 2020-08-19 18:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7656b1163102b98c7c7fd1489fd29c34 SHA-1: 30bc42ef5d8de41056e8c995fbeaeb654a2ecdfb SHA-256: 1fb5af549e247a8c235a5aa88858e2d9a6aa69892a5f67d15e1e2848d3a28b9b
120 Risk Score

Malware Insights

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

The PDF file contains a mass external PDF link farm, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'startup cost worksheet example'. This suggests the document is designed to redirect users to malicious infrastructure, likely for further exploitation or credential harvesting. No scripts were extracted from this sample.

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=startup+cost+worksheet+example
    • http://files.relinksoutheast.org/uploads/1/3/1/0/131071249/tafujiwesu-xifap-ladodunudubibes-jibibivutabu.pdf
    • http://files.cuttingedgeschoolcounseling.com/uploads/1/3/1/3/131379875/zenupobu.pdf
    • http://files.morjimcocopalms.com/uploads/1/3/1/3/131384789/2a0aea98a146c0c.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/kofujesudobinefu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1512/5662/files/90480495973.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1695/files/pubuse.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/cash_flow_format_for_project.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/savaseze.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/74497770923.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6074/files/pazad.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/amazon_business_strategy_2020.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_off0000681a.bin
dbc649c1f07f2b124d5b76f1819cf94bd49b095f833c580befff63b6192dc500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681A 5500 bytes
font_01_sfnt_off00007ab7.bin
f9455c3cfc902404ca1d770ca82f50c740f0892696a7ceeb0858adc368718a60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB7 10160 bytes

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