Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6e62d10762f49f…

MALICIOUS

PDF

50.5 KB Created: 2020-08-25 03:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4783eb66bb6994d117a29aa5c531719 SHA-1: c31db0c8147aed97183a5ee5b8905449e96c6166 SHA-256: bc6e62d10762f49f424c81d6a278e71e435f8ab0f82ac64ca0df35437fa1c3c1
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains and one primary redirector URL. The ML classifier strongly indicated maliciousness. The primary malicious URL is https://ttraff.cc/pify?keyword=psychological+pricing+theory+pdf, which is likely used to redirect users to further malicious content. The presence of numerous links, many benign but some unknown, suggests a tactic to obscure malicious destinations within a larger set of links.

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/pify?keyword=psychological+pricing+theory+pdf
    • http://files.dianawilderauthor.com/uploads/1/3/0/8/130813511/16e009fbdeb0.pdf
    • http://files.carolinastormhedgehogs.com/uploads/1/3/1/6/131637291/fanipewonosewagafuv.pdf
    • http://files.ballerinabites.org/uploads/1/3/2/6/132682676/9850100.pdf
    • http://tokiso.frigatebirdfishing.com/uploads/1/3/2/6/132696212/lajenuv.pdf
    • http://bafilij.torontoequestrian.ca/uploads/1/3/1/4/131452903/kudejate-pemoza-mazesimoges.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7755/files/reguza.pdf
    • https://cdn.shopify.com/s/files/1/0435/4880/3227/files/fojimak.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/doperitikutumuras.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4261/files/speak_english_with_vanessa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6897/1418/files/98177214706.pdf
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/pathogenesis_of_inflammatory_bowel_disease.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/webuvidedosepaduxim.pdf
    • https://cdn.shopify.com/s/files/1/0429/1995/2540/files/bollywood_action_movies_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/5242/5631/files/83391793184.pdf
    • https://cdn.shopify.com/s/files/1/0431/0184/7713/files/choosing_wisely_guidelines_breast_cancer.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_off00008572.bin
c7f6014dd38f2ea48430a3db2ccc522fe9ed82fbe8f90971a8b692ef451cb5ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x8572 5520 bytes
font_01_sfnt_off0000982c.bin
b9982cab91fe533b34964fd7e17bd420352389871dd3fd2e374cdc1f265309b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x982C 11008 bytes