Malicious PDF — malware analysis report

Static analysis result for SHA-256 2436c0a014898ac2…

MALICIOUS

PDF

39.6 KB Created: 2020-08-30 20:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1506ec8ebd4f64e6be3d66568acea560 SHA-1: d023297a1a1da1717d32dab3159796065ed8f45e SHA-256: 2436c0a014898ac22443005c87060d3943b88ff606faef0443c1017ee5639773
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a download for a film, which redirects to a malicious URL. This is further supported by heuristics indicating the PDF links to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier also strongly flagged this PDF as malicious.

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=download+film+dear+nathan+360p
    • https://cdn.shopify.com/s/files/1/0452/5981/7117/files/meiosis_cell_division_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/associao_de_resistores_resumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6179/6248/files/sasutenilak.pdf
    • https://cdn.shopify.com/s/files/1/0434/0636/0725/files/bopixadodowimipujowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/97125505961.pdf
    • https://cdn.shopify.com/s/files/1/0440/2960/8101/files/19691750831.pdf
    • https://cdn.shopify.com/s/files/1/0430/1488/1433/files/57705381783.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/53712917957.pdf
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/jupeladob.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/8434130659.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5916/files/31725753072.pdf
    • https://cdn.shopify.com/s/files/1/0429/1765/8780/files/65364142008.pdf
    • https://cdn.shopify.com/s/files/1/0428/7148/8668/files/papitapaxijitawonidemulax.pdf
    • https://cdn.shopify.com/s/files/1/0436/5336/5910/files/75142200287.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/pekavinoxurasavifu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0885/1098/files/fikesofufigi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5918/2745/files/rexomosuxide.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_off00005bbc.bin
40cda38b6f81374a774506eee977534434febb6cdaa23ff3c10a58c0c914fd86
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBC 5656 bytes
font_01_sfnt_off00006ee4.bin
672239b92765f1d00171f74fedf647e053652f1c39e0c292c903c4c745c4a208
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE4 10060 bytes