Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a36753fa948abea…

MALICIOUS

PDF

42.5 KB Created: 2020-08-19 01:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 756e6abb98f3164988435c7954d0e6dc SHA-1: 644aab45c8d2ff90a1fe4b32672b12700288b062 SHA-256: 0a36753fa948abeaad271edbc1606e1a4f658d2bd671837ba7aedb81e330c2b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com). This behavior is indicative of a link farm designed to obscure the true destination and potentially distribute malware or phishing content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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.com/pify?keyword=the+botany+of+desire+pdf
    • http://files.showfancy.com/uploads/1/3/1/0/131070918/3693526.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0461/9704/7447/files/98935288385.pdf
    • https://cdn.shopify.com/s/files/1/0428/0346/2303/files/nevexovukudedapufefetele.pdf
    • https://cdn.shopify.com/s/files/1/0433/0287/9387/files/building_front_elevation_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/8584/6945/files/50024511745.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0322/files/balkar_ankhila_all_song_pendujatt.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98223768302.pdf
    • https://cdn.shopify.com/s/files/1/0434/0154/3830/files/holy_bible_catholic_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/50326835090.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/jitude.pdf
    • https://cdn.shopify.com/s/files/1/0438/3699/7792/files/ccna_todd_lammle.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.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_off0000699a.bin
5da43d6088e0999ac7333488820318f1584369980dd2d293e9be0102c1576fa2
pdf-font-stream PDF embedded font (sfnt) at offset 0x699A 5288 bytes
font_01_sfnt_off00007b89.bin
123d9e410e341de6b80b7b12c01e3ebfb14804ed8574d85dcf2e22d33a4a38f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B89 9892 bytes