Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf2109eaeb920d0…

MALICIOUS

PDF

42.8 KB Created: 2020-08-11 03:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 879ae5ab06f587c911d76106ba80c63a SHA-1: d1445a0ecb10b0be7f33cabef83e43cfa6e2c250 SHA-256: 0bf2109eaeb920d05c797897fe1eb0364d3237a7715b0cce33de543d7a43b3ee
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to a harmful destination. The document body, though partially obfuscated, contains URLs that are also present in the heuristics, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=utdrag+belastningsregistret+enskild+person+pdf
    • http://files.highlandbaptistgordo.com/uploads/1/3/1/3/131380480/64536b3.pdf
    • http://files.nhlogcabinrental.com/uploads/1/3/1/6/131606733/wiweteselovip_bamanotobuxomep_valafonafovi.pdf
    • http://files.disabledandproud.org/uploads/1/3/2/6/132695734/38ca50615cfe.pdf
    • http://files.fixyourmess.com/uploads/1/3/1/6/131637254/dezir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6392/6174/files/38283577974.pdf
    • https://cdn.shopify.com/s/files/1/0435/1308/6106/files/sat_probability_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/5539/0630/files/52223533724.pdf
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/salexexasevo.pdf
    • https://cdn.shopify.com/s/files/1/0435/7901/5327/files/majowedavijisufajim.pdf
    • https://cdn.shopify.com/s/files/1/0437/4046/3255/files/merge_mac_terminal.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/62162063861.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2317/files/suvomajinoduk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/64733856078.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5902/files/76454234046.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0429/7631/3503/files/70342358806.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_off0000674d.bin
f71cadc358721a9e0ff1eb65bbe6fe6aa9184cf5a3d5649de6fd1d03a3c9daa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x674D 5404 bytes
font_01_sfnt_off000079b5.bin
e285c4203eeab2dc68b368946b4230fd37407290b9fec584fbc18d203852f51a
pdf-font-stream PDF embedded font (sfnt) at offset 0x79B5 10572 bytes