Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd375c557b55f090…

MALICIOUS

PDF

38.9 KB Created: 2020-09-17 07:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b1c36abc216d467ef257b2c2028ea9a SHA-1: 865471e12ac742902ee3363587a3031981c11135 SHA-256: bd375c557b55f090aaedeb1f8d780903a63c571ec8ec400cc2876e77bab263ac
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'verbs' and 'worksheet answers', likely a lure. The presence of numerous embedded URLs, including the malicious one, suggests a link farm or redirection strategy. No scripts were extracted, limiting the analysis of direct payload execution.

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.me/wix?keyword=ar+er+ir+verbs+present+tense+worksheet+answers
    • https://20f3e33c-06ed-49d8-808e-05fa3a34189d.filesusr.com/ugd/f515ca_5817b07ed975404fa1e52c6e7ef7b676.pdf?index=true
    • https://cb6e6c7e-34b4-45e6-8d63-53fcba4cc475.filesusr.com/ugd/8a05ec_ddb939a2983c46309cb63c1925121b42.pdf?index=true
    • https://0c7bd707-e800-4efb-a26b-6ba5267a3fdb.filesusr.com/ugd/3d0627_be8f0e620fcb47dab9a3430da8e78b2e.pdf?index=true
    • https://8cebd8ca-fb28-47d0-ac97-b3d92aa5fdb9.filesusr.com/ugd/451a43_78c72859d8264229ad474d4b8277f5e9.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/0785/2192/files/52539780770.pdf
    • https://cdn.shopify.com/s/files/1/0438/0118/2370/files/the_scrambler_manual.pdf
    • https://cdn.shopify.com/s/files/1/0451/3991/9001/files/macro_combine_data_from_multiple_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/7828/7513/files/28156526599.pdf
    • https://cdn.shopify.com/s/files/1/0430/4551/9513/files/juvinora.pdf
    • https://cdn.shopify.com/s/files/1/0434/2710/2887/files/atm_complaint_form_rbi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/jujoweladupanusubumovewos.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_off00005aca.bin
69aa94b64614d01a281d6d5db00533859e358fb372c21143eb63811cfbff205d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACA 5220 bytes
font_01_sfnt_off00006c98.bin
9beacb24bb13deb13380483a578801cb114ea383223d59106ed573dd8503da93
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C98 9980 bytes