Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2978e81863accc…

MALICIOUS

PDF

51.2 KB Created: 2020-08-24 05:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29c6585a0f93c72892c71b9e39d8febf SHA-1: e80c6dcf73e660c65c7edc5598872c302e606b93 SHA-256: 5e2978e81863accc128ffc59de6765d89ade59b14b7c8dd7af1706446527bc5d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to link farms and at least one known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is an answer key for a 'webquest', likely a lure to encourage clicks. The ML classifier strongly indicates 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.ru/pify?keyword=honoring+our+veterans+webquest+answer+key
    • http://zekokif.goldenreiki.co.nz/uploads/1/3/1/4/131438304/dorebevofejinezeg.pdf
    • http://files.gaming4ed.org/uploads/1/3/1/3/131398489/1601702.pdf
    • http://files.deeplydepressedtraveler.com/uploads/1/3/1/4/131454850/145fe.pdf
    • http://files.ambleon.net/uploads/1/3/0/8/130814085/1225289.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/mount_bromo_tour_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/digomabatazedukak.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/werireguroz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/52922824011.pdf
    • https://cdn.shopify.com/s/files/1/0436/5382/4677/files/69062702507.pdf
    • https://cdn.shopify.com/s/files/1/0430/3087/2215/files/usa_time_zone_map_with_states.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/vilod.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4135/files/biwagavid.pdf
    • https://cdn.shopify.com/s/files/1/0435/9651/3448/files/gasomekefepiri.pdf
    • https://cdn.shopify.com/s/files/1/0440/4989/1478/files/rasikumixunowabezu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7183/1193/files/91829211443.pdf
    • https://cdn.shopify.com/s/files/1/0439/1727/9400/files/42328580006.pdf
    • https://cdn.shopify.com/s/files/1/0434/8415/1974/files/47741603113.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_off000073ae.bin
86112c7a573b5ab9e557c8d2866b9088edf6dbc2cefea02d2a371fd213beea8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AE 5368 bytes
font_01_sfnt_off00008618.bin
0b08e332db3e0ff6d1f7a04f2addc95ee98254f3698a285264c47337177afebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8618 10568 bytes
font_02_sfnt_off0000a9ec.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9EC 16204 bytes

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