Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c79131bcc517f8…

MALICIOUS

PDF

42.0 KB Created: 2020-08-09 09:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef574c1fff9565d12ca35d8d609b742b SHA-1: b5766c30b378625d67c51138cfdbbc0ecfc8ffb4 SHA-256: c7c79131bcc517f85b49c550a0071464fd10f8fdb28481638928b0acd52af991
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical redirector link to 'ttraff.cc'. This indicates a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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=british+council+teaching+english+lesson+plans+pdf
    • http://files.photocolorongraphics.org/uploads/1/3/1/4/131437779/2454445.pdf
    • http://files.tradeinservicesinternational.com/uploads/1/3/1/3/131380942/juwaworulosu_filisawa_bokidejelo_kupabovak.pdf
    • http://files.rtkilgore.com/uploads/1/3/0/7/130776489/7482952.pdf
    • http://files.trbtoolsofthetrade.org/uploads/1/3/0/8/130814121/sulezo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/98524011968.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/sotikujapulalidutena.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/ludaneditenuzasi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0609/8597/files/barista_training_manual_starbucks.pdf
    • https://cdn.shopify.com/s/files/1/0429/0491/2031/files/pavanunoxiwemiborov.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3318/files/nitro_pro_9_to_word_converter_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/adverbs_exercises_upper_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/jivuri.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/90335245234.pdf
    • https://cdn.shopify.com/s/files/1/0436/5156/3670/files/kpss_tarih_hap_bilgiler.pdf
    • https://cdn.shopify.com/s/files/1/0435/2930/6263/files/wizakogasuxude.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/41312795342.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_off0000640e.bin
2cf128e6101c2d0f24965ae3d9567d7eda94f45f6f0a306a847b421efddf678a
pdf-font-stream PDF embedded font (sfnt) at offset 0x640E 5468 bytes
font_01_sfnt_off000076a8.bin
3b3fbf6d4ca1935f095528b647022bea85a5d185d01f3ab5f534118ebe3d39b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x76A8 10560 bytes