Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0520ef8c24c65b…

MALICIOUS

PDF

57.9 KB Created: 2020-08-09 22:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdf1099010d65df1c5f698f1055c2892 SHA-1: 1e24db6922753b7882aaffa1134b2cf726a9a993 SHA-256: 8e0520ef8c24c65bf7c3fb9f7d5e2ce471bee28ee2b825597de669de46075f2d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a document about "bituminous pavement construction". The ML classifier strongly indicates maliciousness. The embedded URL points to a redirector service, which is a common technique for delivering malware or phishing pages. No scripts were extracted, limiting the analysis of the payload delivery mechanism.

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.ru/pify?keyword=bituminous+pavement+construction+pdf
    • http://fizupape.rcmcm.com/uploads/1/3/0/7/130738732/lugabaf_sevepivofematum.pdf
    • http://files.vonfenja.com/uploads/1/3/0/7/130776887/982665.pdf
    • http://files.leighandbloo.com/uploads/1/3/0/7/130775623/d1a3850.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2106/files/pthon_use_remainder_to_find_date.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruwofejimu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vixegenosevisime.pdf
    • https://cdn.shopify.com/s/files/1/0434/1458/5509/files/collections_grade_8_teacher_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/xunepenukoxutupavoxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0982/7231/files/zeditekalanot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdf
    • https://cdn.shopify.com/s/files/1/0444/6637/2775/files/math_worksheets_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0438/8939/3816/files/aeneid_latin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/datawuwabemetixomizodim.pdf
    • https://cdn.shopify.com/s/files/1/0438/7612/2779/files/service_marketing_concepts_strategies_and_cases.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/novugabonalevavutenum.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_off0000a568.bin
1f53419aa7bc70de90498685de28468f43093adf5c2756db25cc5a2b440fc67c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA568 5376 bytes
font_01_sfnt_off0000b7a5.bin
845ec26f6fb36c0839f5d547b610908c53466ea8449efd51d19ec43595feea77
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A5 10208 bytes