Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c3f17481df2cd5…

MALICIOUS

PDF

48.4 KB Created: 2020-08-22 01:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 979dd471e6d883b0b3fe85704dbf7e22 SHA-1: 9ed1b7172a2489efc97b6c41d5c603559af8f3df SHA-256: 72c3f17481df2cd512a5c444e9d0413ba78dd0939e39fef18c7a01eb1ac9d79d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to a link farm designed to host numerous PDF files. One of the primary links redirects to a known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a phishing lure related to financial calculators.

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=annuity+calculator+excel+template
    • http://files.maryrawsonphd.com/uploads/1/3/1/3/131379183/zibuwiwaxa-wezutudaf-tirezizenelof-noniziz.pdf
    • http://files.chainofeventsbw.com/uploads/1/3/1/8/131857115/wotokafepoxukusap.pdf
    • http://files.pettopiakc.com/uploads/1/3/2/6/132695829/8343370.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5736/2597/files/434366598.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/jelovetokig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xogasetixudaxaw.pdf
    • https://cdn.shopify.com/s/files/1/0439/9307/1774/files/lanikovekaxibifuravo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/rounding_decimals_worksheet_6th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/the_martian_epub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.pdf
    • https://cdn.shopify.com/s/files/1/0432/1712/5536/files/biztalk_orchestration_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/53085182799.pdf
    • https://cdn.shopify.com/s/files/1/0452/4094/2753/files/japan_travel_guide_kobe.pdf
    • https://cdn.shopify.com/s/files/1/0450/9663/2472/files/ski_arlberg_piste_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/57186547486.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1673/files/sadidoxedesaro.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000778a.bin
7b74e4522bfd67fdf1c261fa2c2254c3dcc97eed1b798a10feb12939b912278f
pdf-font-stream PDF embedded font (sfnt) at offset 0x778A 5060 bytes
font_01_sfnt_off000088b3.bin
81bb6ac1713a1e7bcfb5e04ebbf44c2ccae21a191f73e6a780f1dc08dce618f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x88B3 13344 bytes