Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0547f6914394668…

MALICIOUS

PDF

48.7 KB Created: 2020-08-31 03:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5f91e5a951d8633dcab2d1b78017f37 SHA-1: 25917417472a7f7ad1549afdfbe2acfd4647919e SHA-256: a0547f6914394668e3f1ec3482489e4255d5231765459240fa8903eed0f563c8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and contains a significant number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. This suggests the primary purpose is to lure users to malicious sites.

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/wix?keyword=las+bicicletas+son+para+el+verano+vicens+vives+ejercicios
    • https://cdn.shopify.com/s/files/1/0462/7261/0464/files/gugagebikolulonewezujedit.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/ramevetik.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/xenogibedurazizofugebiz.pdf
    • https://cdn.shopify.com/s/files/1/0440/9583/2216/files/full_albums_free_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/paduxorisupulemokuti.pdf
    • https://static.usrfiles.com/ugd/b8c837_c339c8983be644e3b4c99bf180b96e90.pdf
    • https://static.usrfiles.com/ugd/4117a9_1a7f4d010a7b49e0a4755b2a3f4a7a47.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/getting_started_with_spring_framework_3rd_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/10414297167.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/biocontrol_science_and_technology.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/bu_online_admission_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d76.bin
b133d7ff3d9db9c4fc2b08be8d00c901a01490fcf867afd60cd366a30dd00f2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D76 4932 bytes
font_01_sfnt_off00007e41.bin
7c7d0bca5e96817dc12d6b8ad30cdd2eedc5c9e073bb9f87e67af34ff01e06ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E41 12356 bytes
font_02_sfnt_off0000a5bd.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5BD 4324 bytes