Malicious PDF — malware analysis report

Static analysis result for SHA-256 6532ac156085d12f…

MALICIOUS

PDF

46.8 KB Created: 2020-08-20 04:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a705cfc5e586faecdece64a64d0ecb2 SHA-1: 39fead2343ce7906d0c22e4be69840176b3a36a1 SHA-256: 6532ac156085d12f0ed0a56fd9a4c3dabd1b959a006367c2a82dac2b2e8b81d9
162 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 a redirector service known for malicious activity. The document body itself contains obfuscated text and references to the redirector URL, suggesting an attempt to drive traffic to malicious sites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=epistaxis+anterior+y+posterior+pdf
    • http://files.360pro.be/uploads/1/3/0/7/130776120/nuponek.pdf
    • http://fazazodu.lumenctr.org/uploads/1/3/2/7/132740214/rebeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0885/0081/files/auld_lang_syne_piano_easy.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/29001226796.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/remote_desktop_port_number.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9032/files/single_stage_centrifugal_pump_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/biblical_hebrew_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/37754115234.pdf
    • https://cdn.shopify.com/s/files/1/0435/1927/9259/files/90057092439.pdf
    • https://cdn.shopify.com/s/files/1/0432/8521/7436/files/wordly_wise_book_7_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0436/9616/0921/files/flat_head_sheet_metal_screws.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_off00007a45.bin
7b40bb9252d24a545230eb9864b2e39280240fd874247de3f4ab95d9478099dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A45 5132 bytes
font_01_sfnt_off00008bd1.bin
0990268625daa2eece84410ddaa25bd0199a5e0e2276e474218daff321085a95
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD1 10188 bytes