Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b283245fbc9732f…

MALICIOUS

PDF

59.1 KB Created: 2020-08-22 04:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db942de798db38ae27be983bba873227 SHA-1: 65a3b2c56bf7286a7ef50e2f7f6aa0e5325dfc7a SHA-256: 6b283245fbc9732f60ee46d3793a2c5bc68e4e561ff47b6cfaafe16d6257d2a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, forming a link farm, with one URL identified as a malicious redirector. The document body, though heavily obfuscated, contains the same topic as the redirector URL, suggesting a lure to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=bollywood+movies+list+2015+free++hd
    • http://files.dirkhambloch.com/uploads/1/3/1/4/131452878/e37f43dbc9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/9369/4366/files/resume_example_for_job_application.pdf
    • https://cdn.shopify.com/s/files/1/0432/3567/2219/files/pizezazuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7963/files/94830362127.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/7697839323.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wogol.pdf
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/99507512884.pdf
    • https://cdn.shopify.com/s/files/1/0430/4843/5861/files/arbeitsbescheinigung_jobcenter.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/42726174983.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/datixirozifiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/nenopuwafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5822/4549/files/sakida.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000092e9.bin
9fc9c4e65b83d3ebe05ec9fe387114e56275d4e9ba41f1bc7e892690073cdb8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x92E9 5692 bytes
font_01_sfnt_off0000a652.bin
3b5ca977eb2deb100660354334ae1cbd5fe990598b5aec10ba77622ccbfa3ba6
pdf-font-stream PDF embedded font (sfnt) at offset 0xA652 10452 bytes
font_02_sfnt_off0000ca33.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA33 16164 bytes