Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4300110b8e2098f…

MALICIOUS

PDF

56.8 KB Created: 2020-08-19 09:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee097321e16ed784d1e8562494191689 SHA-1: 16408cc1f376f9c5dce32945d21b9e59de470e05 SHA-256: b4300110b8e2098f89378582e71ef6fea4c4955c580247059b0d1c25d8274f86
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 external resources, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=baby+rhymes+tamil+video+song+free. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious sites.

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.ru/pify?keyword=baby+rhymes+tamil+video+song+free
    • http://files.cdietconnections.com/uploads/1/3/1/0/131070115/3d286.pdf
    • http://files.campbellchallenge.org/uploads/1/3/1/0/131071166/2276585.pdf
    • http://files.salinenextgen.org/uploads/1/3/0/8/130874478/3800294.pdf
    • http://zubozi.designerplants.org/uploads/1/3/1/3/131380213/vajav-vibujowoza-xufupomedosa-zideduzuwoved.pdf
    • https://cdn.shopify.com/s/files/1/0428/7142/3135/files/cantico_delle_creature_testo_originale.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/80428985645.pdf
    • https://cdn.shopify.com/s/files/1/0427/3097/9495/files/13105950001.pdf
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/16753623837.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/96704100055.pdf
    • https://cdn.shopify.com/s/files/1/0438/9113/0536/files/budget_copy_2020_19_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0432/6886/6208/files/sphinx_and_the_cursed_mummy_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/hebrew_bible_with_tamil_translation.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3671/files/muwukojopavisivi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/55846135469.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/equation_of_a_circle_given_3_points.pdf
    • https://cdn.shopify.com/s/files/1/0437/3794/0117/files/dieta_cetogenica_epilepsia.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b27.bin
4013459e328d6599f3c37ef6c798e510876396a329b5114b17a439cfadcc1ac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B27 5672 bytes
font_01_sfnt_off00007e5b.bin
5c0e874dd76beffd31bd4868d82f491b3cadead12aea739412578b7d5b5e4a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5B 8536 bytes
font_02_sfnt_off00009555.bin
90568e6b96602c43ba4a14718ccd0db645c51ef4a4a3b85ac3448d4aecdbefc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9555 15252 bytes
font_03_sfnt_off0000c4c9.bin
7512c44d75f4c91048b7a78d63063f61640f2c31bb4abebf6e3c093949a8e817		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C9 4596 bytes

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