Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80b811cb9e8c8d3…

MALICIOUS

PDF

42.7 KB Created: 2020-08-04 11:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 180dbdfcf3dd39f274de71d26d15209c SHA-1: d5a8f2211b971f3cb4537f9269a1aed463f036ec SHA-256: a80b811cb9e8c8d3b5f82411680abcc531e9818bacecc3532fae5f1a7e0bc8cf
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 of which point to a link farm hosted on Shopify. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body text, though heavily obfuscated, contains the string 'https://ttraff.cc/pify?keyword=abcam+western+blot+protocol+pdf', suggesting a lure related to a technical document. The primary malicious IOC is the redirector URL.

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=abcam+western+blot+protocol+pdf
    • http://files.teampixiedust.com/uploads/1/3/0/7/130738998/1594389.pdf
    • http://files.rafikibiblestudy.org/uploads/1/3/2/6/132683168/2284116.pdf
    • http://files.wigwampalmdesert.com/uploads/1/3/0/9/130969080/0c3394fd3c.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/49006981261.pdf
    • https://cdn.shopify.com/s/files/1/0437/3767/7989/files/maxokejexerodigana.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/fiziwoxodekosu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/gemim.pdf
    • https://cdn.shopify.com/s/files/1/0432/9704/6696/files/nolezekaronebe.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/tidibibomezobole.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/10856068189.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/29755983100.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/sirunilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/fokapev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/581871399.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9173/files/timer_for_2_min.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/81491181479.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2883/files/var_mobile_media_itunes_control.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_off000068ac.bin
03c38f83c245f17fe0e0ee9a3a72e09a341a1d6777b6ea4b7318e0219fad0e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68AC 5520 bytes
font_01_sfnt_off00007b66.bin
f80b3f8bf306dd93f9b21b12fbc0c0013ec7038c770736598e05f09abe3fc06d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B66 10068 bytes

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