Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73352da85700fb8…

MALICIOUS

PDF

38.5 KB Created: 2020-08-16 11:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d11c01c1febaec70f3c3fec1073e519 SHA-1: cc35574498227e421a42c6c8085ff261074d2371 SHA-256: b73352da85700fb84c175ee8270d04961a49760bb6cee6ad165bc2309fb8beae
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, suggesting a phishing or malicious content delivery attempt. The document body, though partially corrupted, contains text related to an 'Ofsted report' and the redirector URL, indicating a lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of multiple embedded URLs pointing to potentially malicious infrastructure is a strong indicator of malicious intent.

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=bebington+high+ofsted+report
    • http://gakezigov.clockworkspressco.com/uploads/1/3/1/4/131453598/wusuwe.pdf
    • http://files.barbsbelizeandbeyond.com/uploads/1/3/0/7/130740389/7f1240.pdf
    • http://pabiris.lindenhillspottery.com/uploads/1/3/0/7/130739777/7654195.pdf
    • http://files.becomingpreemie.com/uploads/1/3/1/8/131859895/baxako.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/lexopenalifu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1695/files/java_beginner_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/xivijatejidajifijogiked.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/2866554169.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/busesewubus.pdf
    • https://cdn.shopify.com/s/files/1/0433/4836/1375/files/3739962210.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nisej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/tetafibijomeguri.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1569/files/gurisujipabobaraneras.pdf
    • https://cdn.shopify.com/s/files/1/0430/1219/4463/files/asthma_guidelines_2019_bts.pdf
    • https://cdn.shopify.com/s/files/1/0435/3910/3912/files/espectro_de_absorcion_atomica.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5274/files/sogaraguzabuvim.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/70029460801.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_off000058ce.bin
ba471fc1cb7a6eb3adf2aa0710f447c8cb9bdb3d940202bd6b7446f45dd67ddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58CE 5252 bytes
font_01_sfnt_off00006aa6.bin
16c93ba9a8f4e1458c406c11f26669631c67a7e7d65c5786a4fdccb1c235533e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA6 10088 bytes

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