Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a498cfa9d26dcd8…

MALICIOUS

PDF

44.5 KB Created: 2020-08-23 09:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6177ffceb9aa0fe272ac4d4f7f1fffd SHA-1: 0ae537245037600bc28e868c607e23fc76390402 SHA-256: 5a498cfa9d26dcd85d2a8df483f9e44be26528758b0b0169f3c531b96a289212
154 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, though heavily obfuscated, contains a URL that leads to this redirector. The presence of numerous links suggests an attempt to create a link farm or to direct users to malicious content, potentially for phishing or malware distribution.

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=national+lgbti+health+alliance+inclusive+language+guide
    • http://files.mcfootball.org/uploads/1/3/0/7/130739155/nazufojikuke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5114/5626/files/google_sheets_textjoin_new_line.pdf
    • https://cdn.shopify.com/s/files/1/0438/6023/0294/files/euphonium_treble_clef_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/9578/5629/files/light_energy_worksheets_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdf
    • https://cdn.shopify.com/s/files/1/0434/3208/3612/files/texas_instruments_92_plus.pdf
    • https://cdn.shopify.com/s/files/1/0432/2590/7368/files/basic_tactics_for_listening_transcript.pdf
    • https://cdn.shopify.com/s/files/1/0435/3723/6119/files/fasting_bible_study.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/turujeripuwa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/boogie_woogie_piano_score.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_off00006fe8.bin
e05f4e30d300d2f80821c94e6736563b10d4afc473f9dfede9b362efde18542a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE8 5272 bytes
font_01_sfnt_off000081d5.bin
adc736a2153c22489ff6db42c88e4b2fd790b6b9a4e325d5d07ba4f07d48913a
pdf-font-stream PDF embedded font (sfnt) at offset 0x81D5 10472 bytes