Malicious PDF — malware analysis report

Static analysis result for SHA-256 335a744735dca78e…

MALICIOUS

PDF

39.1 KB Created: 2020-08-20 13:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e870934f8b98c528bcbe7241d5663a80 SHA-1: d1e7dd89e8705ff18c1683755603b4fc9c7204a6 SHA-256: 335a744735dca78e52d7be8132c73796e8956a4db2206e08456ed569547c25a7
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The document body contains a URL that leads to a redirector service, which in turn points to a Shopify domain. This suggests a phishing or scam attempt where the links are used to obscure the true malicious destination. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=sedimentary+rock+worksheet+elementary
    • http://vazejota.thinking-drinking.com/uploads/1/3/2/6/132680981/gisawawirinebel.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8622/files/26174919347.pdf
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/biochemical_analysis_of_fish.pdf
    • https://cdn.shopify.com/s/files/1/0433/9272/9246/files/kurikulum_pendidikan_islam_di_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/singular_and_plural_nouns_worksheets_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/kovelebosina.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/cha_cha_slide_audio_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/stein_complex_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0436/3629/3785/files/niziroposotodup.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/lewenonowor.pdf
    • https://cdn.shopify.com/s/files/1/0440/8023/4661/files/estructura_de_la_administracion_publica_en_guatemala.pdf
    • https://cdn.shopify.com/s/files/1/0432/4435/5739/files/18155050788.pdf
    • https://cdn.shopify.com/s/files/1/0463/1330/8325/files/bowunowozelurowonepabi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2309/6216/files/makikovujoxomawofejim.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_off00005a38.bin
2dbe54924a7e67dc011dedca21949c67993eb20b202cfefbfc476f77910e2233
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A38 5540 bytes
font_01_sfnt_off00006cf4.bin
3f97758edf9349bbc8a47679d67cd4f1bcc6c24361a3621e9c995178e722d363
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF4 10176 bytes