Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fc5563bd8b89ed…

MALICIOUS

PDF

41.8 KB Created: 2020-08-21 05:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd74b217a68fa95dc76e3e81d328f17a SHA-1: 6acf86bd4660fea7c8116e2d0e050a1a08c828f2 SHA-256: 37fc5563bd8b89ed2a2806e5adc294384978c4fa5546aeb3a74403e0376003bd
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a link farm hosted on Shopify, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=managing+conflict+interview+answers', which is flagged as a malicious redirector. This suggests the document's primary purpose is to lure users to malicious sites, likely for further exploitation or phishing.

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.com/pify?keyword=managing+conflict+interview+answers
    • http://febikiju.monicaariasmiranda.com/uploads/1/3/1/4/131406717/a24d5f89d072b.pdf
    • http://vekezu.thenerdyperv.com/uploads/1/3/1/3/131380505/4139883.pdf
    • http://buzakos.lionenvironmental.com/uploads/1/3/1/4/131453068/0af86c17b.pdf
    • http://tukoborug.ghysa.com/uploads/1/3/2/6/132683051/zowuleni.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/system_analysis_and_design_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/kennewick_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/6090/4615/files/14832609698.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/majusotogozarow.pdf
    • https://cdn.shopify.com/s/files/1/0445/6975/5812/files/40th_birthday_party_invite_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/automatic_door_control_system.pdf
    • https://cdn.shopify.com/s/files/1/0432/8774/0576/files/31583910888.pdf
    • https://cdn.shopify.com/s/files/1/0437/9446/4929/files/kgb_archiver_setup_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/95778240061.pdf
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/3_branches_of_government_worksheet_4th_grade.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_off00006610.bin
d0a4bba67e4d9d74596698eae3afbd305c43b97688f9913ff96266bbb6ddc06f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6610 5204 bytes
font_01_sfnt_off000077ed.bin
a0e24086701ff14afb89ce94b57ba3c32fa9389f86db78c98295e9184e90c21d
pdf-font-stream PDF embedded font (sfnt) at offset 0x77ED 10160 bytes