Malicious PDF — malware analysis report

Static analysis result for SHA-256 49bb43467f154a79…

MALICIOUS

PDF

38.9 KB Created: 2020-08-11 21:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20a16691d4946cdef0c0e6240edfad02 SHA-1: 2284c70f46c96ef296a457a9b7a38504c0a8c60a SHA-256: 49bb43467f154a797eda7c41f5b24941201d244c1ada7f8cb95c828a4748e37a
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'water pollution images pdf' and the malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a lure to a malicious redirector.

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=water+pollution+images+pdf
    • http://files.kimmisenerdunn.com/uploads/1/3/2/3/132302780/lekidisigaz_rilinubideroka.pdf
    • http://files.gijogymnasticsofillinoisjuniororganization.org/uploads/1/3/1/8/131857152/2206830.pdf
    • http://nupimo.jamisonphotos.com/uploads/1/3/1/4/131406149/6522ebf488.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/51574894566.pdf
    • https://cdn.shopify.com/s/files/1/0431/1914/9216/files/riworigasilixiza.pdf
    • https://cdn.shopify.com/s/files/1/0431/3710/6087/files/vogeguxipu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6698/2561/files/shia_islamic_books_in_urdu_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/python_check_if_key_in_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3170/files/assignment_problem_maximization.pdf
    • https://cdn.shopify.com/s/files/1/0428/4458/6140/files/79421290094.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/7068289213.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3455/files/ponipogikapobilok.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/seward_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/0723/6503/files/form_100-_es.pdf
    • https://cdn.shopify.com/s/files/1/0437/6179/5230/files/6170868881.pdf
    • https://cdn.shopify.com/s/files/1/0435/9490/7810/files/lipeligufazanebu.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_off000058f9.bin
4b6853b513a5d9d2c0f8825c03465430d504c131dcb8d357f37f4d2ece21d734
pdf-font-stream PDF embedded font (sfnt) at offset 0x58F9 5372 bytes
font_01_sfnt_off00006b34.bin
3e91ab8774180638be87cbd9e91f337ff9ab0c3f9b0708faba9f75c5e72c07bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B34 10416 bytes