Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b281caffeb9780b…

MALICIOUS

PDF

47.4 KB Created: 2020-08-05 17:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c20c6e6f616940e93d98b2a83e7209a SHA-1: 67786b737a682b1ea3ee6479a1524da154cfacc5 SHA-256: 7b281caffeb9780b6b279ac5adcb8f69233ec9a703760e20449a6a67936fc266
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, forming a link farm. One of the primary links, https://ttraff.cc/pify?keyword=chol%25C3%25A9cystite+chronique+lithiasique+pdf, is identified as a malicious redirector. This suggests the document is designed to funnel users through malicious infrastructure, likely for phishing or malware distribution. No scripts were extracted, but the presence of the malicious redirector and the link farm strongly indicate a malicious intent.

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=chol%25C3%25A9cystite+chronique+lithiasique+pdf
    • http://files.laingsburgbands.com/uploads/1/3/0/7/130775014/nezavuselomesebewuwo.pdf
    • http://files.createandtransform.org/uploads/1/3/0/9/130969573/5402059.pdf
    • http://files.quilledcards.com/uploads/1/3/0/8/130873851/vasenudipekodekis.pdf
    • http://files.scoutingadventure.com/uploads/1/3/1/4/131453539/tebutazulo.pdf
    • http://files.milkwelllactation.com/uploads/1/3/0/7/130739674/gamixu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2639/8888/files/43565764207.pdf
    • https://cdn.shopify.com/s/files/1/0437/6422/0055/files/68615955931.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/zefana.pdf
    • https://cdn.shopify.com/s/files/1/0432/9468/7400/files/guletabagu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/81211567353.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4103/files/70475832722.pdf
    • https://cdn.shopify.com/s/files/1/0433/0989/1742/files/69797996689.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8965/files/3gp_mobile_movies_free_download_hollywood.pdf
    • https://cdn.shopify.com/s/files/1/0431/8458/6909/files/checkpoint_ccsa_r80_dumps.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/xovekilun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0605/files/83972880410.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/91723220340.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007497.bin
f0ccb5688afb89f63dfb291f89748ba5036d49f76cd4613bc2494f87c01e393b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7497 5516 bytes
font_01_sfnt_off00008711.bin
8ba0c5e1cdf8ee17ec74080980209b67f796e15c28f8d0adc0b0e7a262b706a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8711 12584 bytes

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