Malicious PDF — malware analysis report

Static analysis result for SHA-256 434f623687d50cc5…

MALICIOUS

PDF

51.4 KB Created: 2020-09-01 21:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7cc36d341a4ea68069039dc99a3c24f SHA-1: 319fcf07a0554e8497497280bf9fc94e5b061148 SHA-256: 434f623687d50cc57607d66521345ff3624bb9ba31aa336d3366d86400edeece
152 Risk Score

Malware Insights

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

The PDF contains a lure related to 'Fema is- 700b exam answers' and embeds multiple links. One of these links, https://ttraff.cc/wix?keyword=fema+is-+700b+exam+answers, is identified as a malicious redirector. The document also features a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness.

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/wix?keyword=fema+is-+700b+exam+answers
    • https://static.usrfiles.com/ugd/0a51c1_789c270e1078434f810e8c72c6651b27.pdf
    • https://static.usrfiles.com/ugd/83b1b3_cecc966900bd4a4b88cc0c36ca377927.pdf
    • https://static.usrfiles.com/ugd/b8c837_15a4cccd73704f5798b33229dc70b888.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5669/files/94158493624.pdf
    • https://cdn.shopify.com/s/files/1/0434/4594/4481/files/augmented_reality_in_education.pdf
    • https://cdn.shopify.com/s/files/1/0432/0909/7384/files/73147295029.pdf
    • https://cdn.shopify.com/s/files/1/0433/4200/4375/files/51274744190.pdf
    • https://cdn.shopify.com/s/files/1/0441/0294/2872/files/human_anatomy_terminology.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/13978829063.pdf
    • https://cdn.shopify.com/s/files/1/0463/0708/2402/files/gagomegolepavemakenoxixo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/13109957035.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/budd_chiari_syndrome.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_off00007f97.bin
95e782b7f5367c88f5e90aaea74e1924b02629c4a22b0e4197fb10b395ab11ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F97 4908 bytes
font_01_sfnt_off00009035.bin
bc969a15dec03113ceb7af46ccf44664c97519835d647317f98f30bfec410ddb
pdf-font-stream PDF embedded font (sfnt) at offset 0x9035 10224 bytes
font_02_sfnt_off0000b305.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xB305 4324 bytes